The dominant reason for believing in the FET is that commonly accepted knowledge that people grow up with cannot be right. That's it. There is no evidence for a flat earth, and flat earthers talk about the heaps of evidence but always avoid discussion on that topic and never show any evidence. The essential point of FET is to doubt a highly complex and complete theory for no logical reason and without pointing out any flaws.
How about this guy " class="bbc_link" target="_blank" rel="noopener noreferrer"> He looks like Dennis Leary, except he is making a comedy routine about NASA and flat earth. Is it serious, or just a comedy act?
I have suspected recently that the majority of so called FET don't care about real shape and only care about attention and being cool or hipster. You can see it clearly, because they are always accusing each other of stuff instead of debating the real issues.
There are only a few such as "Stars are Souls" who seem to have an earnest desire to present truth as they see it.
Matt Boylan is interesting, I think he's like Leo Ferrari with a youtube channel, but I prefer him to the psycho's like the Eric Dubay crowd, some of those people are seriously disturbed whack jobs.
Stars are Souls, seems genuine, but leaps to conclusions with zero evidence, and just declares things to be fake for no reason.
Mark Sargent is very smooth and plausible, but leaves holes you could drive a truck through, he favours UA.