Who would really gain from lying about it?

[flatearther]The satanic powers that be, who else? The globe in every class room is the first step in conditioning the children's mind to the dogma that they are not special or important to a loving deity, and merely random emanations of chaos on a speck of dust circling a useless star destined to burn out in just a few billion years. Would they be as good as slaves to the machine if they grew up knowing that their thoughts and deeds matter, that each of them is the center of their own universe, if they had a grasp of the true nature of the world surrounding them? Just watch the "Truman Show" to understand how pervasive the implications are![/flatearther]

It's just contrary to doubt so much science.

I don't disagree, but maybe that's not even necessarily a bad thing in a time and age where "science" (or what is sold as such) is [ab]used to legitimize all sorts of ideologies and political actions. Personally, I greatly appreciate the insights into science I gained from scrutinizing flat earth claims and trying to debunk them with the same intellectual honesty Richard Feynman advocates.

This is an argument that was settled hundreds of years ago.

Historically, that doesn't mean much... ;)

I just cannot take them seriously.

It's not always easy, that is true :)