It just turns out most of that thought isn't worth hearing, is easily manipulated externally and by emotions, and poorly educated.
I've stared to think that handing everyone the "microphone" of something like YouTube is actually a way to prevent even moderately subversive thought from ever reaching the mainstream.
Basically let people say what they want - but they have to complete with every other loud moron, while ignoring the manufacturing of consent through traditional channels.
It's horribly dystopian. I almost long for a time when running a pirate radio station meant you had a political message you felt needed to be heard.
Pirate radio stations generally weren't run by people who had things that needed to be heard, in the US most notable examples were simply people who thought broadcasting music illegally was worth getting raided by the feds.