Caveat:
Part of why Robin Williams' death hurt so much was that, before we knew he'd ended his life early due to a degenerative illness - back when it "simply" seemed to be suicide in depression - we were surrounded by people genuinely shocked that a funny man could have been sad himself.
That reaction devastated a lot of us. Couldn't they see Williams' lows as well, which infused his comedy?
His death reminded us how many cannot see mental crisis behind a smile.
And *that* hurt. Still does.