I don't think this has anything to do with sanity. This has to do with people for seeking self confirmation instead ot disproval.

For pretty much everything there is a conspiracy theory out there claiming the opposite, and these types usually started out searching the internet for someone else who believes the same that they did at the time.

But, as we all know, this technique will eventually lead to overfitting. And that's what those types of people have done to themselves.

Well, and as lack of education is the weakness of democracy, there's a lot of interested parties out there that invest money in these types of conspiracy websites. Even more so after LLMs.

Whoever controls the news controls the perpetual presence, where everything is independent of the forgotten history.