Crimes and Mental Illness

As we know it almost all crimes cause by human behaviour. We all suffer mental illness some are temporary and some are permanent. There are some kinds of mental illness and one is depression. Depression is a common mental illness because almost all of us suffered depression. I think some of the most common cause of depression are; failure to achieved goal, doing and remembering embarrassment, problem with society, family problems, and etc. Is mental illness dangerous? Yes, it is dangerous not only for the one who suffered it but also for the society.  Is mental illness is just an illness for the poor, low class people, and lower society? I think NO this is true not all successful people and leader are happy sometimes they are depress and some suffered depression before they succeeded. One of the great leaders in history who suffered mental illness is Adolf Hitler. Do all mentally ill people behave the same? Yes, I think they all have a common behaviour and decision.