Ignoring the ideological aspect of war crimes would be easy if we could chalk up mass killings to a few psychopaths, to human nature, or to perpetrators being forced to commit unspeakable atrocities. Instead, we’re forced to confront a more disturbing reality: War crimes, torture, rape, and barbaric murders are often carried out by people who are disturbingly like ourselves. Ordinary humans, when seduced by ideologies of violence, can be extraordinarily brutal.