I agree with Greven. Behavior and our reactions to it have been shaped by evolutionary pressures. And in different situations different survival stategies have been more successful. An interesting new theory about truly psychotic people proposes that while society will always (and rightly so)deem them as abberant, they do appear to be an actual viable genetic variety rather than a genetic defect. They display a whole range of common characteristics seemingly unrelated to the actual antisocial personality.