It has been too long since I went down the hole, but there was a place where the child actors would go during the time of Mork and Mindy, Happy Days etc. that he, among others, were known to frequent. I don't remember the details, but it was not a good looks for any of the folks involved. I think he was not a bad soul, and the drugs allowed him to live with himself. Obviously, a fair amount of opinion here.