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by the_af 1001 days ago
Today? I think most flat-earthers are indeed having fun with an elaborate, long-running joke. Some even sort of admit it. (And some are truly deranged, of course).

Back then? Flat earth made all the sense in the world, according to the empirical observations possible at the time. Only it wasn't able to explain some phenomena (e.g ships "sinking" over the horizon), and so evidence accumulated against it, eventually.