Bingowings said:

Evil people rarely intend to do evil or even recognise themselves as such.

I can't boycott much of his work because I purchased them before discovering how repellent his views currently are (like those Gary Glitter records I still have but can't ever play out loud).

In the rest of my finite lifespan there will be other authors.

I don't see how I'm supposed to be obliged to continue to purchase his books.

Of course. If you feel no compulsion to buy his stuff, then I of course don't mean to force you do it. I just don't think that alone is enough of a reason not to. If it helps, I've never read Huck Finn anyway ;)