I would think that keeping PvP levels lower is more authentic, because in real life people would have conscience, guilt and morals, which isn't modelled in the game. People who are mass murderers in the game would, in the main, NOT behave that way in real life. Anyway, why not let the server admins decide whether they want to keep PvP down to sensible levels, or whether they will let people shoot on sight? What's so stupid about choice? I know I have a definite preference.