Well. We have a chance now with internet and independent infrastructure like Nostr. 
But I posted recently interesting article where guy (among other things) saying that for example vaccines efficiency was regularly discussed in history, but state propaganda had  always "overwritten" the result of that discussion.  

 Paradoxically, with the current tech, it's been seemingly easier to isolate people (and their thoughts) than in the previous decades.

But I'm pretty confident that's just transitory. The feedback loupes are shortening and you can't shield yourself from them.