FWIW: if we were to actually feel horrible for enjoying all art ever created by Hideously Awful People, we'd be consigning most art in history to the furnaces. (My favourite example being Beethoven, who utilized his position to steal his nephew from said nephew's mother and then drove said nephew to the brink of suicide, and who was basically emotionally abusive to everyone in his life ever, so.)

Horrific people can, in spite of themselves, make good art. The art doesn't justify their horrificness, but their horrificness also doesn't automatically remove their art. *hands*