Anecdotally, in China, the younger generations can’t get answers from the older generations who lived through these times because it’s verboten to speak of them. It leads to an (academically interesting) censorship feedback loop.
From my perspective it’s hard to know what you don’t know if the Powers-That-Be want to keep it a secret.
For example, here in the U.S. I assume we’re reasonably censorship-free, but by no means am I confident we have access to everything (excluding governmental information requiring clearances).
I do recognize our various media outlets play a major role in determining what the narrative is and which stories/reports/messages are raised to the level of societal recognition. I know people who consider this to be an indirect form of censorship.