Extreme hyperbolic example, and to be clear I am not actually accusing anyone of anything, but imagine that there were evidence that Brewster was using IA donations to fund a meth addiction. I don't think anyone would blame me for stopping donations to that because my intent was for the money to go to archiving, not drugs.
I don't think Brewster does meth, and even if he does I don't think that he's spending IA money to do it, but I do think he's spending IA money in pursuit of a lot of lawsuits that are a result of flagrant disregard for copyright law, at which point it feels more like I'm funding a lobbyist group, not an archive.
To be clear, I really dislike US copyright law, and I'm not even really opposed to people breaking it, but my opinion of of the law is somewhat irrelevant. The fact is that flagrant disregard for it at the level of IA means that lawsuits are going to happen. I don't really want to spend money on that, though obviously it's fine if other people want to.