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I became curious about the flat earthers and watched 2 videos to try and figure out if there was any sort of deeper meaning to their superficially ridiculous claims (spoiler: there isn't)Whether by design or accident the flat earth nonsense has the potential effect of unmooring people from the very notion of an accepted reality; and thus habituating them to the idea that what they inherently know about the world cannot be trusted. It literally pulls the world out from under their feet.
That is, if you can get people to believe or even question that something as fundamental as the shape of the earth is a lie they've been told, then you can effectively "clean-sheet" them. They become blank-canvases upon which you can write the alternative reality of your choice. Not to mention this type of nonsense generates mistrust in the status-quo, as it raises the question among its victims: "who is this 'they' who lied to us about such fundamental and important matters?"
So, if you then claim to be against the status quo, then you have sympathizers who are now open to your message. It thus becomes much easier to write your story onto their now blank canvases and serve as their champion.