There have always been evil people, with or without seeing violence. Cain killed his brother out of jealousy. Jails are full of convicts who thought murder was the best way to get rid of someone. There are serial killers who choose strangers. Murder seems to be in the human DNA for lust, for money, for feeling powerful. It's evil, and we will never be able to stop it. It's a mind set, the same as abusing children or animals. It's a burning hatred that needs to be fed by slaughtering others. Its a lack of respect for life. Until we can understand the human mind and stop picking on the "instrument" of the act, then we have a chance to isolate these evil ones before they can act.