The right thing to do of course is to speek truth to power openly and before everybody else does it, but this could come with serious consequences for the person speaking up. This is why they’d only do it once they are 100% sure they didn’t misread the situation, the thing that happened was actually big enough and they are willing to carry the consequences this could have for free software.
In other words: people in positions like Stallman can get away with much more than any regular guy, which means they should be extra considerate of their role and their environment if they care about the effects their own power and fame has on it. If it everybody steps up now, it means there was clearly a disconnect between his self image and what his environment thought about him.