Regardless of GreenEarth's gross misrepresentation of the potential for exploration of a Flat Earth and surrounding universe, it should not matter, even if a Flat Earth would somehow produce utterly terrible results for all humanity.
We should not believe what we believe because it makes us happy, but because it appears to be true.
It would be wonderful if there were an ancient treasure trove of immense value buried ten feet beneath my lawn. If there weren't, I'd be quite upset. Should I quit my job and spend wildly on the basis that I'll no longer need to worry about money if there is, in fact, treasure?