One of the truck drivers at my work is a flat earther, he explained it all to me one day
Basically it's the ultimate conspiracy. All of the other theories tie into it, but they're just the tip of the iceberg.
For most flat earthers it is a religious thing -- the true world is flat, beneath the earth is another plane of existence (hell) and the stars and space are not what they say they are. They're unknowable heavenly objects in another plane (heaven). Beyond the edge of the world is a massive plain of ice inhabited by giant beasts
The reason NASA lies about this is because they have been corrupted by Satan, and by hiding the true nature of the world leads people away from god. The only people who actually know are the illuminati, who control NASA and everything, and the NASA agents just get paid hush money or something
This sounds like an awesome netflix miniseries but he just needs to go sailing
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