Why do we feel that a Robin Williams is not supposed to be human?

Every year, there is an untimely death of an entertainer it seems.

They say something like Celebrities have all the money and fame love of their fans, so what do they have to be depressed about? Robin Williams was 63,( not that that is old) kind of known for his addiction. We’ve known so many others who died untimely death because of addiction. I don’t see how it is so shocking. I mean esp. after John Ritter (who was so much younger, no history of addiction etc.)?

And is the gory detail necessary?