Williams was hardly a brave comedian. I can recall seeing him mock dumb whites, rednecks, inbred Appalachians, and Republicans. I can't recall ever seeing him take on blacks, or Hispanics, or Jews, or Asians, or liberals, even individually.
One of his favorite targets was the Nazis, those timely sources of topical humor. He resurrected them on a number of occasions in order to roast them; he must have figured this would please his bosses in Hollywood.
(Is there anything less funny than a political correct comedian who picks only on safe targets?)
On top of that, it turns out he was a well known comedy plagiarist. (If he was such a comic genius, why did he have to steal so much material?)
In his movies, he was far more over-actor than actor. He chewed the scenery ravenously and shamelessly tried to steal every scene he was ever in. All the while looking very pleased with himself.
This treacly scene from Patch Adams is a good example.
Or this "heartwarming" trailer, from Jack.
(I always wondered what would have happened if Williams and Jim Carrey had ever been cast together, as both men desperately needed to be the center of attention.)
Williams had "neglected child" written all over him. To his credit, he admitted as much, according to Wikipedia, saying that his upbringing had "left him with an acute fear of abandonment and a condition he described as 'Love Me Syndrome'."
Williams provided trusts for his three children, also to his credit. But he was evidently having financial difficulties, and in 2013 was on the verge of declaring bankruptcy. That may have had something to do with his suicide. That, and the fact that he no longer commanded the same attention he once had.