Yes, exactly. It's an article about the psychology of violence, not morality. It's point is that people who commit violence believe themselves to be moral. ie,

Yes, exactly. It's an article about the psychology of violence, not morality. It's point is that people who commit violence believe themselves to be moral. ie, they are acting in accordance with whatever system of morality they happen to hold. Their actions might be totally immoral according to another morality system, but that person is still moral in their own mind.