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It also depends on the nature of what the artist did. I already own all the Sandman books, so reading them doesn’t further help Neil Gaiman, but I don’t think I’d ever be able to read them again anyway. Other artists whose crimes weren’t as horrible, I might be able to pick up again without greatly degrading my enjoyment of the work (although I can’t think of any authors on my shelf off the top of my head that would apply to)