I don't think anyone reasonable is trying to prevent him from airing his personal opinions (contra what many people are claiming in this thread), and there are indeed many people who are open to listening to those opinions -- but whether you think he ought to leave GNU or not, it's unfortunate that he triggers such strong negative reactions from many people. Some pretty responsible and knowledgeable people such as the EFF's head of cybersecurity have described him as a "creep". [1]
While I believe that what he said[2] is so far beyond the pale of responsible discourse that removing him from his positions, as two organizations have done, was the right decision[3], I also believe that that's not really relevant for this particular thread. He founded GNU. He runs GNU. He probably can't be forced by anyone to leave GNU. None of that changes the fact that he will probably not be a very effective leader of GNU, even if he was before.
[1] https://twitter.com/evacide/status/1172287971220848640
[2] He said that an underage sex trafficking victim's "plausible" apparent consent means that the people who raped her did not commit sexual assault.
[3] Even putting aside the forum in which he made these comments, and the things he has said and done at other times.