Just a thought experiment, let’s say the earth is flat, looks like many professionals would know, including
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Pilots/ATC/sea captain
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Land surveyor and civil engineers
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Astronomers and Geologists, at least the one dealing with experimental data
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Militaries, at least radar operator and artillery
Just these categories are already a lot of persons, I assume I miss a lot of others. So how many person does it make in total ? 10 % of the population ?
What’s comical about the idea of a flat earth being hidden by the government is that it presupposes that it’s either a multinational conspiracy lasting for literal millennia or that the government manages to doctor and fabricate every communication you’ve ever been privy to, except, of course, the ones flat earthers disseminate freely and publicly.
But as someone who attended public, government-funded schools and grew up thinking that a flat earth was QED until Columbus sailed the ocean blue in 1492 and blew everyone’s mind, I’m not so sure they ultimately really care if Joe Schmo thinks one way or the other about the curvature of the earth (apart from maybe being a litmus test for incorrigibility, gullibility, or education).