If I could gather all the bitterness in the world and put it in a bottle, I would label it EXCLUSION. I especially think this is the reason why the mentally ill get into so much trouble with the law. They are pushed around and abused and picked on, stared at and such. They have no one to talk to about it, no one who is sympathetic to their plight. Everybody 'understands' why people feel upset with them.
I wonder how much their trouble making would change if people were nice to them and accepted them as people who have a chemical 'condition' that renders them unable to control certain aspects of their minds. It's just a thought. Treating people decently might get big dividends for society.