I agree, to an extent. If you decide not to support them because of one thing though, and decide you won’t change your opinion, that isn’t helpful though. If you aren’t winnable then you don’t matter. You need to hold them to account, but not be so strict you’re a waste of effort. You need to be a target that they can actually hit, or they will move to a group that is winnable (or they’ll lose and you’ll get their opponent).