Thank you HSG for bringing this topic up. I was thinking of doing so, but didn't have the energy with so much going on.
It is my opinion that many people who are highly creative are prone to mental illness. There's no way of knowing if the mental illness contributes to the creativity or if the creativity contributes to the mental illness. Before your post I was watching some of Robin's comedy acts and I commented to my sister he may have been manic.
Through my research and my discussions with my pdoc, it's a definite that people with OCD are usually highly intelligent. While I pride myself and have always been thankful for my intelligence, I'd happily give up some of my intelligence for some relief from my OCD. I hope I didn't sound conceited by what I just said.

I said to a friend when I learned of his suicide "here come the rude and misinformed comments about mental illness and addiction being a weakness and suicide being selfish." I usually respond to people with that opinion "suicide is not a sign of weakness or of being a coward, it's simply an attempt to end pain and suffering that has become unbearable." I receive a lot of positive feedback with that statement.
Robin Williams was a comedy genius and from the nice stories (not just from the media) I've read since his passing, he seemed to genuinely be a wonderful person. He certainly provided many hours of enjoyment and laughter to me. R.I.P. Robin!