I have a personal story of mental illness and crime. My brother has a very rough time of it as a young man. He was always getting in to some kind of trouble. He was arrested for drug possession, petty theft, public drunkenness, vandalism and other minor crimes. He was never a bad kid, he just couldn't seem to stay out of trouble.
Well, when he was in his mid 30s he was diagnosed as bi-polar and began to take medications. The change has been amazing. He has stayed out of trouble, has a full time job, is seeing a very nice woman and has big hopes and plans for himself that he never used to have. I believe that all his problems as a young man were the result of his mental problems. If he had only received treatment sooner he might have been able to avoid years of grief and struggle.