These people are attacking Stallman to reinforce their self-image of being "good" and "progressive".
Both are deluded. Stallman has no influence on the topics they contend but these people unfortunately have some influence in this matter.
This is a poor assessment, as it doesn't account for the fact that people cultivate the environment they want to be a part of. Removing people like Stallman from positions of influence within the community changes the tone of the community; while you may believe that change would be for the worse, it's better to acknowledge that others genuinely believe the inverse, rather than dishonestly dismissing it as blind reinforcement of self-identity.
They shouldn't lose their positions because of Stallman's beliefs, but because of their own unwise decision to return him to a position of greater influence.
In that case, would you agree that the stuff about his opinions is irrelevant? In fact, given that there's some likelihood he'll remain at FSF and certainly will remain a famous programmer, wouldn't it then be best to draw as little attention as possible to his unpopular opinions? (This is not the same as "wouldn't it be best to draw as little attention as possible to his alleged bad behavior", because whereas him mistreating people would be bad no matter how many people knew about it, him having unpopular opinions that won't change anything does not harm anyone, and if people are distressed to learn about those opinions, then publicizing those opinions increases that distress.)