I don't have anywhere else to write this, so I'm going to write it here.
"Mental illness" is many times used for suicide for the benefit of the survivors, not the suicide victim. There can be depression, manic behavior, etc... YES. But in general these are treated with some regularity these days.
Anyone who does a large number of drugs over an extended period of time is very comfortable with death, and even more comfortable with suicide. This is the same with all adrenaline junkies. No one goes skydiving with an irrational fear of death, you know? It's just in their (our) minds that all drug use is some sort of slow suicide ANYWAY... so why worry about it?
Hunter S. Thompson stands out of a person of similar mind and drug history who also took his own life after a really nice weekend with family. In this case ALL the family knew that he didn't shoot himself out of depression or mental illness, he did it because he wanted to. And this was later confirmed by things he had told others.
I can't say that is what happened here. I can just say that there are many who battle depression, sobriety, and stress, but mostly they battle those around them that are perpetually concerned with their depression, sobriety, and stress. You know, some people just like to LIVE, not be reminded of everything that is wrong with them. When you have desperate need to answer the unanswerable, you get Rick Warren with the death of his son claiming mental illness when, in reality, there isn't a pill that makes having RICK WARREN as a father tolerable. When you have understanding, you get Hunter S. Thompson who died on his own terms with the blessing of his family.
It is very difficult to speculate what it is like to be Robin Williams, but there is a lot about this that is completely understandable. The louder the comedian, the more tender their hearts are. Everything from falling off the wagon with public scrutiny to expectations of what everyone wants as soon as you walk into the room. It's all too much... and there is no drug, prescribed or poured, that can help make that tolerable... there's just not. So in whatever moment he had whether it be frustration, exhaustion, trapped, or alienation... I know he did what he did to solve a problem. It's not what everyone wants, but sometimes you get tired of giving a flying f**k about what people want.
He gave us all an incredible gift. We were lucky just to have him this long. But now it's HIS time and he solved his problems... his way.
For that, I say good for him. :-)