What seems like "obvious garbage" to you, might be a treasure to another person.
What good is it being a visionary if people ignore or actively reject the message because they are put off by the messenger? It’s not useful being a harbinger of doom if nothing changes anyway.
Stallman should be commended and recognised for starting the free software movement, but he should’ve stepped aside long long ago and let someone more charismatic be its figurehead.
¹ I’m sure someone reading this has had a different experience, but please do a cursory web search and recognise people’s negative interactions with Stallman are not rare.
Each person reading this might come up with some different in their search. Do you have a specific example to point to?