I think MJ being in the public eye from childhood is relevant. He was extremely famous before he had the opportunity for at what was at best deeply inappropriate relationships, so there is a point where he was innocent.
The court cases muddy the water because some people accept the not guilty outcomes.
I think the fairest thing to say is that money corrupted the course of justice. Over time, learning more about safeguarding, I've been more inclined to believe that he was an accomplished groomer and abuser and more likely to have been guilty than not.
Play of his music declined in the 2000s until his death. Many feel that as he can no longer benefit from royalties, that there's little benefit to cancelling him now.
MJ's music remains influential and culturally relevant. If it wasn't, then it wouldn't have been commercially viable to create a revival with the film (money talks again). Gary Glitter's music did not have that level of influence and longevity. Cancelling Saville only really means editing him out of vintage Top of the Pops footage; Jim'll Fix It was never even going to make re-runs on BBC4.
I don't turn MJ's music off, but I don't seek it out either. I didn't want to see the film because that's too much about the artist. When my students ask if I like MJ, I tend to say that I like the music but not the person.
People that are sucessfully "cancelled" tend to be of limited influence or longevity in their works. There's never going to be consensus about a point at which someone should be cancelled e.g. someone upthread lumping JK Rowling in with rapists because they don't like her views.