Man or monster The psyche of a criminal

Why do people murder, hijack and rape and why do they sometimes keep repeating these crimes? Violent crime is a phenomenon that both horrifies and fascinates us. What can go so horribly wrong in man's psyche that he turns into a monster? What makes monsters of us, and does a monster skulk in each of us? Some experts believe that, given the right circumstances, any one of us could become a murderer. I. You. Anybody.