Depends.

Is the artist dead? Then sure.

Will they benefit in any way from my support of their work?

Then no.

Did I pay for it before I found out that they were X, Y, or Z?

Then enjoy it, or don't, just don't give them more money.

Yeah, I've got most of Gaiman's books. I still think his collab with Pratchet was brilliant. But he'll never get another cent from me. Roman Polanski? I pirate his shit, he and his estate will never see my money.