Your comment actually led me to read Stallman's original comments in context, since I was aware of his dismissal/resignation but didn't know the particulars.
In my opinion, what he actually said on the listserv is very benign compared to the consequences he faced for it. If that is the whole story, he was treated unfairly.
"The message of universal software freedom is a radical cause; it's basically impossible for one individual to effectively push forward two unrelated controversial agendas at once."
And that part of the story is pretty fair. RMS held non-mainstream /academic/ views on sexual morality. It's like dropping someone from the 2020s, accepting of LGBTQ, into Victorian England. Or a 2020 Saudi Muslim in San Francisco in the sixties. Or vice-versa. Or worse yet, and ancient Roman/Spartan in 2020. Imagine they adapt their behavior, but continue commenting on how the place they're in is bizarre.
In some ways, that made him less effective as a free software advocate, as did many of his other more controversial views on just about every topic. In others, that made him more honest.
In my opinion, what he actually said on the listserv is very benign compared to the consequences he faced for it. If that is the whole story, he was treated unfairly.