We make lots of generalizations about all sorts of decentralized groups: conservatives, liberals, whites, the wealthy, the poor, etc and we manager to understand that we're generalizing--that we're talking about a statistical distribution of opinions or behaviors, but for some reason with BLM, the moment they are generalized, the "they are not a corporation" argument comes up, and I would argue this generalization about BLM holds a lot better than the average generalization about nearly any other group.