Seriously...
Nature has a grand design and has perfect balance. So they'd have to prove all the other planets are flat as well. the sun too. that just doesnt make sense with gravitational pull and revolution of moons and planets, sun rising in the east and setting.. and gee yea were all lying...more like who's paying them to say the world is flat?
What do flat earthers get out of this?
I dont speak the best english here or the smartest but I can definitely rationalize the earth is round.