At the end of the day, the FSF board had to decide what they wanted to do, either a) let RMS continue to do his usual thing without repercussions and become a less-relevant organization that people don't take seriously, or b) clean house and maintain some level of trust. Presumably they also considered a c) let RMS continue to do his thing and hope that there's no fallout. But I guess they considered (c) wasn't realistic, didn't want (a), and decided on (b).
No one is saying that RMS's work with GNU or the FSF is somehow invalidated. He's done some absolutely fantastic and amazing work, and I honestly do believe that, without him, we are actually losing something valuable. But we're also losing some bad stuff too. My feeling is that the bad stuff outweighs further good that he could do, but of course that's open for debate.
> ... because of a poster and some tired anecdote about plants?
Deliberately minimizing and dismissing the allegations against RMS is a bad-faith way to push forward your argument. Please don't do that here.