people who still believe in a flat earth in this day and age have no concept of how basic physics works
even if you don't believe there's anything actually in orbit of earth, even if you believe earth is just a flat disc accelerating upward at 9.8m/s, what's causing the earth to accelerate upward? what about plate tectonics, how do mountains, volcanoes, ridges, and trenches exist in a world where plate tectonics is pretty much impossible?
how come we have tides, and 24 hour days instead of 6 hour days? that isn't possible without a satellite as big as the moon in orbit of the earth
in fact, without the moon, there would be very little inertia to keep us or the atmosphere in place, meaning we would all die from the sun's harsh radiation
but I guess the sun doesn't have very harsh radiation if it's super small and actually quite close to us
only it's not, because that doesn't explain lunar eclipses, other easily observable celestial bodies, and the international space station which can be seen from a fucking telescope
the moon landing being faked is one of the more popular and well-founded conspiracy theories, which is why it's still discussed to this day
you don't have to be crazy to think it was faked, just a bit of a skeptic