I ask because I think the time is coming when many of us will have to fight them. I've known quite a few people , some family , others from the neighborhood , family of friends who from fighting the viet cong up to the "drug wars" and counter insurgencies in central america in the 80s to fallujah in Iraq fought monstrous people , and themselves did monstrous things. Kidnapping , interrogations, summary executions etc. These were for the most part decent people who were required to do terrible things. In my observation they went one of two ways. They either became psychopaths who just enjoyed hurting others , or enjoyed seeing others suffer , or became alcoholics or addicts , and just empty shells. So how does one fight beasts without becoming one ?