I've never believed that there are "sane" perpetrators of violence. I mean, modern gangster rapers use violence in their raps, and no-one is accusing them of being dangerous. They are celebrated as heros. Some poor broken hearted chump loses his or her grip on reality, and,wow, they are the ultimate bad guy. They can't fight back, and they can't explain why they did something mean. One person who has a diagnosis of schizophrenia commits to a crime, all schizophrenics are dangerous. Well, that sounds familiar. Like all african americans need to be "civilized by us superior europeans." Racism and sexism and elitism they all justify looking down on groups of people who can't fight back. They are bullies. Nothing more or less.