Describing his work as a marriage of social and forensic psychology with history, Dutton aims to explain the psychological mechanisms that generate extreme violence, including genocide, military massacres, lynchings, and prison riots. Sadly, he finds that most people are capable of visiting horrific violence against others, especially in social situations wherein a subjectively defined out-group becomes perceived as a threat to an in- group's view of their place in the world. He also identifies B process dominance as the mechanism by which individuals become inured to brutality. However, he notes remaining limitations in psychological explanations of extreme violence.