The mental illness and angry people could all be fixed with the use of pot regularly. They'll be happy and care free once they start this prescribed treatment.
On a serious note, the former marine guy who killed those 11 people in California lived with his mother. I bet his morale was in the dumps because he had to go live with his parents again. I wonder if his so called friends made fun of him because he was still living at home. It's hard to pick up chicks at the local country western bar when they find out you live with your mom still.