There's lotsa undesirable types in the world: racists, sexists, homophobes, xenophobes. There's murderers, rapists, pedophiles, drug abusers, inveterate woman beaters.
The shelves that hold my CDs, DVDs and books contain works of art made by a variety of undesirable types. If Michael Jackson did in fact molest young boys--and it's amazing how many people are convinced that it is a fact, how they seem to want it to be a fact--then his albums remain a part of my rotation. I can no more get rid of it then trash books by Burroughs, music by Miles, or films by Polanski.
There's art. There's the artist. Inextricably linked? To my mind, no.