Some of the evidence that came out in the civil trials was pretty compelling. I read an article in Vanity Fair years ago, when he was still alive (so able to sue, if he wanted to) where some of this was elaborated on.
For example, some of the boys were able to give identifying features of his penis, when erect.
Of course, he paid out huge sums of money to settle, in the end. Why would you do that, if you were innocent? Why would the families even bring it to court? (I know from experience that litigation is not a barrel of laughs, and not something to enter into purely out of speculation.)
Members of the family have come out to say they were sexually abused as children. (Others have denied it, but if they were not abused, personally, they may well just not know.) Someone who is sexually abused as a child is more likely, in turn, to abuse children themselves.
I know it's innocent until proven guilty, but this utterly taints his music for me.
Jimmy Saville was never found guilty in a court of law, either.