I don't know or care much about Stallman and the situation, don't really have a dog in this fight. What I do know is that "It's been like this for decades" is never an appropriate defense.
Not "it's been like this" -- he, a human person, has been like this. In fact he's been voluntarily blogging his political thoughts for decades (which, again, in 2019 is an incredibly dangerous thing to do).
So the question is this: if he's had his outspoken opinions on controversial topics for decades, there's no evidence of his opinions actually causing any real tangible harm, and under his tenure the FSF has been a runaway success -- why is it an issue now?