I don't want to go too far down the road of my personal feelings about activism and what other people should do. I think people should do what they think is right. I could even see someone make a reasonable argument that states they feel as strongly as I do about Vox Day and racism yet don't feel that rescinding their KS pledge is a good idea. So rest assured my intent was not to label others hypocrites.
The difficulty I have with Jard's proposal relating to charity donations is that it does nothing about the issue which makes me sad in the first place, which is Vox Day and his followers using the KS as a platform to promote views I find repulsive. My hope is that my actions convince others to drop their pledges and that in turn convinces Alex to disassociate himself from Vox and his followers. Or, at the very least, it makes Alex less likely to agree to a future deal like the one he made this time around.
My personal opinion is that making a charitable donation will have less of an effect on Alex's behavior than rescinding a pledge.
I would never tell you not to do it though. I think it's highly likely that all I'm doing is making myself feel better and that Alex could care less about my pledge. So who am I to tell you that your donation is a bad idea? If it makes you feel better about the situation, do it.
I mean, you're taking action to make the world a better place. If I take the $60 I was going to spend on the KS and spend it on cheeseburgers, then there's a pretty good argument that you're the one accomplishing something good while I'm just massaging my ego.