Between Worlds

Between Worlds · essays on displacement, trauma and belonging

When the War Doesn’t End

PTSD, displacement, and why “just settle in” is the wrong thing to ask — and the right thing to build.

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There is a moment that repeats itself on quiet streets across Europe, and almost no one reads it correctly.

A man who arrived eight months ago from a place that no longer exists as he knew it is standing at a bus stop in a northern European town. Someone walks up behind him too quickly. In a quarter of a second — faster than thought, faster than choice — his body has already decided he is in danger. His heart rate spikes, his vision narrows, his hands come up. To the woman who simply wanted to ask the time, he looks aggressive, unstable, frightening. To three teenagers filming on their phones, he looks like a story that confirms what they already believed. To himself, he looks like someone who is, once again, failing to be normal.

Everyone in that scene is misreading it. Because what they are watching is not a character flaw, a culture, or a threat in the ordinary sense. It is a nervous system that learned, under conditions none of the onlookers can imagine, that hesitation gets you killed — and has not yet been told the war is over.

This essay is about that gap: between what displaced people carry and what host societies see. It is not a comfortable subject, and I want to be honest from the first line about the two lies that usually bracket it. The first lie, told by people who mean well, is that war leaves no mark — that a refugee is simply a neighbour who took a longer road, and to notice any difference is prejudice. The second lie, told by people who mean harm, is that the mark is the person — that certain origins produce certain natures, and the danger is who they are. Both are false, and the evidence is unusually clear about why. The truth sits in the uncomfortable middle, and it is far more useful than either edge: war and displacement inflict real, measurable injuries on the mind, those injuries carry real social costs, and — this is the part that changes everything — the injuries are treatable and the costs are preventable. What looks like fate is physiology and circumstance. And physiology and circumstance can be changed.

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I. What the body brought with it

Start with the organ that did the surviving.

The human brain is, above all, a threat-prediction machine. A small structure called the amygdala runs continuous, pre-conscious surveillance for danger; the hippocampus files experience into time and place ("that was then, this is now"); and the medial prefrontal cortex — the deliberate, reasoning part — acts as a brake, able to look at the amygdala's alarm and say stand down, it's only a door. In a safe life, this system stays quiet and calibrated.

Sustained terror recalibrates it. Decades of neuroimaging converge on the same picture in post-traumatic stress disorder: an over-reactive amygdala, a hippocampus that is often measurably smaller and worse at stamping experiences as past, and a prefrontal cortex whose braking signal has weakened (Rauch, Shin & Phelps, 2006; Shin & Liberzon, 2010; Bremner, 2006). Underneath sits a dysregulated stress-hormone system — the HPA axis — with the paradoxical cortisol signatures Rachel Yehuda's work first mapped, and a noradrenergic system stuck in a state of high alert (Yehuda, 2002). The clean way to summarise a large literature is this: in PTSD, the brain keeps predicting the catastrophe that already happened, and responds to present-day cues as if the threat were still live (Psych Scene Hub review, 2024).

This matters enormously for how we judge behaviour, because it means the "symptoms" of trauma are not weakness or wildness. They are an old survival programme running in a new environment. Hypervigilance kept you alive when snipers were real; it does not switch off because you crossed a border. The startle response that made you drop and run was adaptive under shellfire; it is merely humiliating in a supermarket. Emotional numbing let you function while burying friends; it now reads to a caseworker as coldness or non-cooperation. The brain that survived the war is not broken. It is superbly, tragically well-adapted — to a world that, for it, has not ended.

Judith Herman gave the most severe form of this a name in her landmark Trauma and Recovery (1992): where classic PTSD follows a single terrible event, prolonged, inescapable, repeated trauma — captivity, war, sustained abuse — produces something deeper, which she called complex trauma. The World Health Organization formally recognised Complex PTSD in the ICD-11 (2018): alongside the core PTSD symptoms, it adds lasting difficulty regulating emotion, a corroded sense of self, and a profound difficulty trusting other people and sustaining relationships. Read that list again with a newcomer in mind — emotional volatility, low self-worth, deep mistrust of officials and neighbours — and you can see how much behaviour a host community files under "won't integrate" is, in clinical terms, a predictable injury pattern.

There is a further wound that the neuroscience alone misses, and it is the one clinicians who work with war survivors say cuts deepest. It is not fear. It is moral injury: the lasting damage done by witnessing, failing to prevent, or being forced to participate in acts that violate one's deepest moral beliefs (Litz et al., 2009). The person who watched a child killed and could do nothing, who chose which family member to save, who complied to survive — carries not just terror but shame and a shattered sense of a just world. Fear responds to safety. Moral injury does not; it needs meaning, and meaning is exactly what the limbo of the asylum system withholds.

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II. The numbers we don't say out loud

How common is this, really? The instinct on all sides is to guess — high, if you want alarm; low, if you want reassurance. The measured answer is more sobering than either.

The most rigorous synthesis to date, a 2020 systematic review and meta-analysis in PLOS Medicine pooling studies across fifteen countries, found that roughly 31% of refugees and asylum seekers had PTSD and roughly 31% had depression — rates an order of magnitude above the general population (Blackmore et al., 2020). A separate meta-analysis of refugees resettled in high-income countries put diagnosable PTSD or depression at up to one in three (Hoppen & Morina, cited in the same literature). Germany-specific work reached the same neighbourhood: around 30% PTSD symptoms and nearly 40% depressive symptoms among refugees and asylum seekers (Nesterko et al., 2021). The earlier, more conservative benchmark — Fazel, Wheeler and Danesh's 2005 Lancet review of 7,000 resettled refugees — still found PTSD roughly ten times the rate of age-matched general populations. And the landmark JAMA study by Steel and colleagues (2009) established the dose: the more torture and potentially traumatic events a person had survived, the higher their odds of PTSD and depression, in a straight line.

Two findings from this literature deserve to be pulled out, because policy routinely ignores both.

First, detention and limbo make it worse, not better. A meta-analysis of refugees and migrants held in immigration detention found PTSD around 42% and depression around 68% (von Werthern et al., 2018) — the conditions imposed after arrival compounding the injuries carried into it. The asylum process, as currently run across much of Europe, is not neutral ground on which people recover. For many it is a second traumatisation with a case number.

Second, without treatment, this does not simply fade. Longitudinal work shows some natural decline over years, but also stubborn persistence, especially in the highest-quality studies (Hoppen et al., 2023). Time alone is not a therapy. A brain locked in threat-prediction, left in enforced idleness and uncertainty, does not spontaneously re-learn safety. It practises fear.

So the honest headline is this: a large minority of the people arriving in European towns are carrying a serious, diagnosable, and — untreated — persistent psychiatric injury. Not a mood. Not an attitude. An injury, with a known neurobiology and a known natural history. To pretend otherwise, in either direction, is to make it impossible to help.

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III. The uncomfortable middle

Now the question everyone is really asking, and which serious writers usually flee: does any of this translate into risk to the host community?

Here is where intellectual honesty earns its keep, because the evidence refuses to comfort either camp.

Begin with the finding the denialist camp would rather you never saw. Couttenier, Petrencu, Rohner and Thoenig (2019), using an exhaustive seven-year dataset of all crime in Switzerland with information on perpetrators, found that asylum seekers who had been exposed to civil conflict and mass killing in childhood were substantially — on the order of a third — more likely to commit violent crime than asylum seekers from the same countries who had not been so exposed. Read carefully, this is not a finding about ethnicity or religion or "culture." It is a finding about trauma. The variable that predicted violence was not where someone was from; it was what had been done to them. Exposure to slaughter leaves a fingerprint, and one of its shapes is a lowered threshold for violence. That is precisely what the neuroscience of a hyper-reactive amygdala and a weakened prefrontal brake would predict. To deny it is to deny the very injury we are asking society to treat.

But now the finding the alarmist camp cannot survive — and it is in the same body of research. Couttenier and colleagues also showed that better labour-market access largely dissolved the effect. When asylum seekers could work, the extra violence associated with conflict exposure fell away. This is not an isolated result. Bell, Fasani and Machin (2013) found that the wave of asylum seekers Britain barred from working was more crime-prone than the wave later allowed to work. Mastrobuoni and Pinotti, studying Italy, found that immigrants denied legal status re-offended far more than comparable immigrants granted it; Pinotti's celebrated analysis of an Italian legalisation lottery showed crime among the newly legalised dropping sharply. Across the wider European literature, the aggregate effect of immigration on crime is close to neutral (Nunziata, 2015), migrants are underrepresented in some national prison systems, and a large share of the crime that does rise around reception centres occurs between displaced people rather than against the settled population (Huang & Kvasnicka, 2019).

Assemble these honestly and a single, non-partisan sentence emerges, one that neither activists nor agitators tend to say: the risk is real, it is produced by untreated trauma compounded by enforced idleness and exclusion, and it is largely eliminated by the things that help people recover and belong. The danger is not a kind of person. It is a state a person is left in. Leave a traumatised human being in a hostel for three years, forbidden to work, unable to sleep, cut off by language, replaying an atrocity nightly with no one to tell — and a minority will deteriorate in ways that harm others and themselves. Give the same human being orientation, purpose, treatment and a path, and the excess risk falls away. We are not choosing whether these people are dangerous. We are choosing which of those two environments we put them in.

And there is a victim here we have barely mentioned, because the public conversation is strangely uninterested in her. The single most robust fact about displaced people and violence is that they are far more often its targets than its source. Europe's own studies of asylum reception are grim reading: the EU-funded Senperforto research documented that a substantial share of residents in reception centres had been sexually or physically victimised since arriving in Europe, most victims women, and — tellingly — a fraction of the assailants were staff (Keygnaert et al., 2012). Cohort studies of newly arrived asylum-seeking women record rates of recent sexual violence that would trigger a national emergency in any settled population. The traumatised woman in the hostel is not a statistic in the crime debate; she is being harmed, now, in our care, and largely in silence. Any account of this subject that discusses only the risk from refugees and not the risk to them is not analysis. It is propaganda with footnotes.

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IV. The trauma that travels

Before turning to what works, one more layer, because it raises the stakes and it is genuinely astonishing.

Trauma may not stop with the person who suffered it. Rachel Yehuda's decades of work on the children of Holocaust survivors — people who never saw the camps — found that they, too, carried altered stress-hormone profiles: lower cortisol, heightened glucocorticoid-receptor sensitivity, the biological signature of a system primed for danger they never personally faced (Yehuda et al., 1998; 2014). Her later research pointed to epigenetic mechanisms — changes not to the genetic code itself but to the chemical marks that govern how genes are read, on stress-regulating genes such as FKBP5 (Yehuda et al., 2016; Yehuda & Lehrner, 2018).

This work must be handled with care, and I will not overstate it: the epigenetic pathway in humans is still described by its own leading researchers as putative, the studies are small, and disentangling biology from the powerful effects of being raised by a traumatised parent is genuinely hard. But even the conservative reading is arresting. Whether the mechanism is a chemical mark on a gene or a childhood spent with a mother who could not stop scanning the room, the conclusion for policy is the same: untreated trauma in a parent shapes a child. The war a grandfather survived can echo in a grandchild's stress physiology and behaviour. Which means the choice a European town makes about a traumatised newcomer today is not a choice about one person and a few years. It is a choice that reaches into households not yet formed. Treat the parent, and you protect a lineage. Abandon them, and you may be paying for it two generations from now, without ever connecting the bill to its cause.

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V. What actually works — and how well

If the essay ended here it would be a counsel of despair, and it should not, because the most important finding in this entire field is the most hopeful one: this is one of the most treatable serious conditions in psychiatry, and it responds even under the hardest conditions imaginable.

Consider a single, almost unreasonable result. Neuner, Schauer, Elbert and colleagues at the University of Konstanz developed a short, pragmatic therapy for war and torture survivors called Narrative Exposure Therapy (NET), born out of working with refugees from the Balkan wars. In a randomised controlled trial among Sudanese refugees living in a Ugandan settlement — people still in poverty, still displaced, about as far from a comfortable clinic as therapy has ever been attempted — they compared a handful of NET sessions against supportive counselling and against basic psychoeducation. A year later, only 29% of the NET group still met criteria for PTSD, against roughly 80% of the comparison groups (Neuner et al., 2004). A few structured sessions, and the majority had recovered — and stayed recovered.

This was not a fluke. NET has since been shown to work for traumatised refugee children in around eight sessions, with gains holding at twelve-month follow-up (Ruf et al., 2010), and — crucially for any system worried about cost and scale — to be deliverable by trained lay counsellors without medical or psychological backgrounds, including refugees treating fellow refugees (Neuner et al., 2008). Europe already has specialist centres that do this work to a high standard — Freedom from Torture and the Helen Bamber Foundation in the United Kingdom, DIGNITY in Denmark, Centrum '45 / ARQ in the Netherlands, the Swedish Red Cross's trauma centres — proving both the demand and the effectiveness. The knowledge exists. The methods are validated. The barrier is not science. It is reach.

And treatment is only half of the recovery equation; the other half is the ordinary architecture of a life. Recall that labour-market access dissolved the excess violence in the Swiss data. The same lever drives everything else. Hainmueller, Hangartner and Lawrence (2016) showed in Science Advances that longer asylum waits — more months of enforced idleness — measurably reduced refugees' later employment for years afterwards; the limbo itself does lasting damage. Marbach, Hainmueller and Hangartner (2018) found that employment bans inflicted durable harm on integration. Work, language, routine, purpose, a door you are allowed to walk through — these are not soft extras layered on top of clinical treatment. They are, neurologically, how a threat-locked brain relearns safety: through repeated, lived evidence that this world is predictable and that you have a place in it. Belonging is not the reward for recovery. Belonging is part of the treatment.

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VI. The arithmetic of doing nothing

Let me put the argument in the terms a treasurer understands, because sentiment does not survive a budget meeting and this argument does not need to rely on sentiment.

Untreated war trauma is not a cost you avoid by declining to spend on it. It is a cost you defer, at interest. It arrives later as tenancy breakdowns and evictions; as school exclusions and a lost generation of children; as chronic physical illness, because a body marinated in stress hormones sickens; as emergency mental-health admissions, which are the most expensive care there is; as the small but real slice of violence the Swiss data quantified; and — if Yehuda is even partly right — as a second-generation bill that lands on services fifteen years from now. Every one of those outcomes is more expensive than the orientation, the early screening, the trauma-informed support, and the fast route to work and language that would have prevented it. The question a council actually faces is not whether to spend on integration. It is whether to spend a little, early, by design — or a great deal, late, by emergency, on the same people, having also absorbed the human wreckage in between.

This is why the framing that dominates public debate is not merely distasteful but strategically stupid. Treating displaced people as a category of threat leads precisely to the policies — exclusion, idleness, indefinite limbo — that the evidence shows manufacture the risk being feared. Treating them as carriers of a treatable injury leads to the policies — early support, purpose, treatment, belonging — that the evidence shows dissolve it. One frame makes the problem worse and calls it toughness. The other makes it better and is dismissed as softness. The data are entirely on the side of the second.

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VII. What we owe the man at the bus stop

Return to him — the man whose body flinched at a stranger's footstep, who looked, for a quarter of a second, like everything the teenagers wanted him to be.

Nothing in this essay asks anyone to excuse harm. A person is responsible for what they do, and a society is right to protect its members. But responsibility and understanding are not opposites, and the most protective thing a society can do — the thing that actually reduces harm rather than merely condemning it after the fact — is to understand what it is looking at and act on that understanding early. That man is not a verdict on his people. He is a nervous system still fighting a war the rest of us can see is over, and the science says the war can be ended inside him, often quickly, often cheaply, and that when it is, the risk everyone was so worried about goes quiet along with it.

We tell these newcomers to "settle in," as though settling were an act of will — as though a person could reason their amygdala into standing down, or decide their way out of a rewired stress axis. It is the wrong ask. You cannot instruct a survivor into belonging. But you can build the conditions under which a threat-locked brain relearns safety, a shattered sense of meaning is slowly rebuilt, and a stranger, given a door and a reason, becomes a neighbour. That is not charity, and it is not naivety. On the evidence, it is the single most effective, most humane, and most economical thing a receiving society can do — for the survivor, for the community, and for the children neither of them has met yet.

The war does not end when the fighting stops. But it can be ended. That is the whole point. That is the work.

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Author's note: Between Worlds is committed to evidence first. Every claim above is drawn from peer-reviewed research or established clinical literature, cited below; where a mechanism is contested — as with the epigenetics of intergenerational trauma — we have said so plainly. Our position is not that displaced people are dangerous, nor that they are unmarked, but that they carry treatable injuries whose social costs are preventable through early, structured, trauma-informed integration. That conviction is also why we build Settle — a multilingual orientation-and-integration programme designed around exactly these findings, to help new arrivals learn how life works here, understand their rights and responsibilities, and begin the process of belonging from day one. The research says early support changes outcomes. Settle is what acting on the research looks like.

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