how someone becomes capable of killing without realizing it.

The short version

Almost nobody snaps. A person becomes capable of killing through a sequence of small adjustments, each one barely noticeable and each one with a justification that makes internal sense. By the time the line is crossed, it has been moved so many times that the crossing does not register. The research calls this moral disengagement, after Bandura. It runs in three steps. The person accepts a framework that sorts people into categories, takes small actions within it that would once have been unthinkable, then reorganizes their identity around the new position so rejecting it means rejecting the self.

• The capacity for killing develops slowly. The public idea of a normal person who suddenly breaks is mostly wrong.
• Each step is normalized before the next is taken, so the person only ever sees the most recent increment, never the total distance.
• Milgram demonstrated this in 1963. Subjects delivered what they thought were lethal shocks because the voltage rose in small steps that each felt like a continuation.
• The people who stopped were the ones who looked back and compared where they were to where they started, which most people never do.

The psychology of violence has a public-facing version and a clinical one. The public version involves monsters. People who snap. A moment where something breaks and a normal person becomes capable of killing. The clinical version is less dramatic and far more disturbing: almost nobody snaps. The capacity for killing develops slowly, through a sequence of small adjustments, each one barely noticeable to the person making it. By the time someone crosses the line, the line has been moved so many times that the crossing doesn’t register as crossing at all.

This process has a name in the research literature. Moral disengagement, as Bandura described it. The term sounds academic. The mechanism is anything but. A person who would never kill a stranger can, through a specific series of psychological steps, reach a point where killing a stranger feels like the only reasonable option. Each step is small. Each step has a justification that makes internal sense. The person never experiences a moment of choosing evil. They experience a series of moments where they chose what seemed necessary.

The steps follow a reliable pattern. First, the person accepts a framework that divides people into categories. Us and them. Worthy and unworthy. Threatening and safe. The framework can come from a political ideology, a religious system, a family structure, a military chain of command. The source matters less than the function: it provides a grammar for interpreting other human beings as something other than fully equivalent to yourself.

Second, the person takes small actions within that framework that would have been unthinkable before the framework was installed. Verbal dehumanization. Tolerating someone else’s cruelty. Following an order that feels wrong but carries a justification from someone with authority. Each of these actions is individually small enough to explain away. “I didn’t mean it that way.” “I was just doing what I was told.” “It wasn’t that bad.” The explanations are sincere. The person means them. And each sincere explanation moves the boundary of what the person is willing to do next.

Third, the person’s identity begins to reorganize around the new position. This is the part that makes the process so hard to reverse. A person who has dehumanized a group and taken actions consistent with that dehumanization now has a self-concept that includes those actions. Rejecting the actions would mean rejecting the self. The psychological cost of that rejection is enormous, so the person doubles down instead. The framework gets stronger. The categories get more rigid. The explanations get more elaborate. And the distance between where the person started and where the person stands now becomes invisible, because the person has been walking the whole time and never looked back.

Caleb in The Marksman is a version of this process applied to a child. Caleb didn’t choose a framework. A framework was installed during the developmental window when the brain is still building the architecture that determines who a person becomes. By the time Caleb could have evaluated what was happening to him, the evaluation system itself had been constructed by the people doing it. He had no external reference point. No version of himself that predated the training. The boundary erosion that takes an adult years to complete was accomplished in Caleb in months, because a child’s boundaries are still forming and there is nothing solid to erode. You just pour the new shape in before the old one sets.

An adult who goes through the same process has one advantage Caleb never had: somewhere in the adult’s memory, there is a version of themselves that existed before the framework. That version may be buried. It may be distorted by years of rationalizing. It may be so far from the current self that it feels like a different person. But it exists. And its existence means the adult, at every stage of the process, had a reference point they chose to override.

Widowmaker in The Widowmaker carries a different version of this weight. A man living under a false identity for fifteen years, maintaining a deception so total that the person he was before the lie has atrophied into someone he can barely access. Dale Haywood didn’t set out to become a man capable of what he becomes capable of. He set out to survive. And each decision he made in service of survival moved him further from the person who would have found those decisions unacceptable.

I’ve seen this process in my office dozens of times, scaled down from killing but structurally identical. A parent who starts with firm discipline and ends up hitting a child. A partner who starts with jealousy and ends up monitoring every phone call, every friendship, every hour of the day. A professional who starts with cutting corners and ends up committing fraud. None of these people experienced a moment of deciding to become what they became. They experienced a series of moments where they did slightly more than they did yesterday, and yesterday’s slightly-more had already been absorbed into their self-concept as normal.

The absorption is the engine. Each step gets normalized before the next step is taken. The person never has to confront the full distance they’ve traveled because they only ever see the most recent increment. A soldier who shoots a prisoner of war did not become capable of that act in the moment he pulled the trigger. He became capable of it across hundreds of prior moments: the first time he called the enemy by a slur and nobody corrected him, the first time he watched someone else cross a line and said nothing, the first time he followed an order he knew was wrong and told himself the person giving the order must know something he didn’t.

Milgram showed this in a laboratory in 1963. Ordinary people, administered what they believed were lethal electric shocks to a stranger, because an authority figure in a lab coat told them to continue and the voltage increases came in small increments. The increments were the mechanism. Nobody was asked to deliver a lethal shock. They were asked to deliver a slightly stronger shock than the one they had just delivered, and each prior delivery made the next one feel like a continuation rather than a new decision. The person who delivered 450 volts did not decide to deliver 450 volts. The person decided, sixty-five times in sequence, to deliver fifteen volts more than they had already delivered. The distance was the same. The experience was completely different.

The people who stopped in Milgram’s experiment were the ones who looked back. They broke the incremental frame and saw the total distance. That act of looking back, of comparing where they were to where they started rather than where they were to where they were five seconds ago, was the thing that made the difference. Most people don’t look back. The process is designed to keep them facing forward, focused on the next small step, operating inside a frame where each individual action is justifiable.

Nobody becomes capable of killing by deciding to become capable of killing. They become capable by deciding, again and again, that the small thing in front of them is acceptable. The small thing is always acceptable. That is what makes the process work. And by the time the small things have accumulated into something enormous, the person doing it has been reconstructed by the process into someone for whom the enormous thing is just one more small thing.

Caleb never had the option of looking back. An adult walking this path at least has that option, even when they don’t take it. The question worth asking is why so few of them take it. The answer is that looking back means seeing yourself clearly, and most people would rather deliver the next increment than do that.

Common questions

How does someone become capable of killing without realizing it?

Through a slow sequence of small adjustments, each one with a justification that makes internal sense at the time. The person never has a moment of choosing evil. They have a series of moments where they chose what seemed necessary, and the line gets moved so often that crossing it does not register.

What is moral disengagement?

Moral disengagement is the mechanism Bandura described for how ordinary people reach acts they once found unthinkable. It runs in three steps. The person adopts a framework that sorts people into categories, takes small actions inside that framework, then reorganizes their identity around the new position so reversing it would mean rejecting themselves.

What did the Milgram experiment show about this?

Milgram showed in 1963 that ordinary people would deliver what they believed were lethal shocks because an authority figure told them to continue and the voltage rose in small increments. Nobody was asked to deliver a lethal shock. They were asked to deliver slightly more than last time, and each prior delivery made the next feel like a continuation.

Can the process be stopped once it starts?

Yes, by looking back. The people who stopped in Milgram’s experiment were the ones who broke the incremental frame and compared where they stood to where they started, rather than to where they were five seconds ago. Caleb in The Marksman never had that option, because the framework was installed before he had a self to compare against.