A gamasutra post on the subject of art made by people whose political actions (not just views) you disagree with.
One thing it doesn't bring up is the issue of big and small.
I don't think it's reasonable for me to boycott a big-budget game or movie because one person involved in the development of it is 'bad' in my view, because there are so many other people involved who may be near-opposites. If person A is on the board of evil corporation B but person C is on the board of good corporation D and they're both working together, boycotting the game is not going to send any clear message. (OTOH, raising a stink about it, making it public, and mailing the big decision-maker about your objection to evil might be a little more meaningful.)
... of course, if the movers and shakers behind the art have declared that all profits from the art will be donated to the cause of evil, then that's different!