@coa999,
It's a discussion that needed to be brought up, and I haven't really directly had experience dealing with "mentally ill", people, but I've had periods of severe depression in my life. I don't know if that qualifies as "mentally ill", but it was very debilitating and insightful as well.
Where do you place hallucinations, both aural and visual, and antisocial behavior? Of course I realize that aural hallucinations might be useful for a composer, and visual hallucinations for a painter, and there is always a place in our violent society for anti-social people during wartime or the CIA, or even politics. And it's possible that so-called mentally ill people are just out of context in our modern contemporary, patriarchal society.
Back in pre-renaissance days aural hallucinations might have been considered messages from God or a demon and might have been considered quite acceptable or, at least, normal.
During the Third Reich millions of people considered Hitler and Goering and Joseph Goebbels not only sane but epitomes of mental health and sanity and even saviors. And many people consider Trump to be totally same too.