It's the old liberal guilt thing, isn't it? I enjoy listening to Burzum, in spite of Vikernes' pronouncements. I'm totally against the idea of not listening to music because of the beliefs of the musician (I differ with Peter Tatchell here), but I'm also not blind to them either. If I came out with my view on Marley at work, I'd be crucified and be called racist to boot
You're right in the sense that speculating about the dead is ultimately pointless, but hell, why not, if it stimulates a debate?