I think you see that with a lot of other revolutionaries. They often take unreasonable positions and behave in unreasonable ways. RMS' tragedy is probably that his side more or less won, so now he's just a weirdo without a cause.
‘The reasonable man adapts himself to the world; the unreasonable man persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.'
RMS is a flawed person, a stubborn unreasonable man with questionable traits. But dismissing his life's work as "said some decent things" is just ignorant revisionist history. We can acknowledge his flaws while respecting the work he did and the overall message, which changed the world for the better.