RMS chose to step down himself. That was his decision. Even if you think MIT told him to, that would ultimately be MIT's decision, not the work of some "mob".
Furthermore, stepping down from MIT is not destruction you're playing it up as being. People have done similar (and of course, worse!) things and, after being the subject of some number of embarrassing articles on the web and some larger number of angry tweets, are currently living their lives with new jobs just fine. RMS doesn't need us to feel bad for him. He's still free & healthy.
If you're worried about kangaroo courts and injustice, there's plenty to focus on somewhere where people's lives and livelihoods are actually at stake, like the US-Mexico border or Hong Kong.
