Here's the thing about FE. No Flat Earther started out as a Flat Earther, while all Globe Earthers started out as Globe Earthers, having been programmed, propagandized, and brainwashed into it from an early age.
I was very skeptical in the beginning, and it took me two years of considering and weighing the evidence to become an FE. And it wasn't because the evidence was unconvincing. Instead, I kept telling myself that I must be missing something that could be used to explain it. No one is excited by the prospect of being derided and ridiculed for being an FE.
Matthew wasn't particularly open to FE, as he relegated FE to a semi-hidden sub-forum.
Several prominent FEs got started by attempting to debunk it, thinking it was a psy-op from the government to discredit those who questioned the moon landings and felt that FE was discrediting them.
As I said, I was very skeptical at first, but from time to time I would take a look in the FE sub-forum to see what it was all about. There was much there that got me thinking and questioning things that I had never questioned before. I've had a very open mind pretty much since 9/11, after which time I came to realize that if the government's lips were moving, they were lying. So I certainly did not rule out a conspiracy or a pack of lies from the "establishment". But the programming was strong in me, and it took me about 2 years to completely shake it. There was something always nagging in the back of my mind preventing me from completely accepting FE. I would post that I "lean FE", but that's about as far as I would go for 2 years. So, despite being open minded, this psychological programming was always there tugging at the back of my brain. In addition, there's the prospect of being derided, mocked, and ridiculed. Between these two, I got to a point where unless I was 110% sure, I wasn't going to commit. Well, I eventually got to that point, where I sat down and objectively considered that the globe was absolutely untenable.
Whenever I'm considering a topic, I try to take the "devil's advocate" approach. I perform a kind of mind experiment, where I pretend that I am an adherent of the opposite position and then pretend to be debating an opponent with the opposite views. In this state of mind, if I can't come up with anything remotely convincing, this validates the opposite position. It's not unlike the scholastic approach of considering the contrary opinions. I've tried pretending that I'm a Globe earther debating and attempting to refute a Flat Earther. I've got nothing that's convincing, unless I'm being dishonest. I could say, "Muh NASA". But that would be dishonest, and I would throw that out there only if I was being intellectually dishonest, since NASA is a load of crap. I could throw the word "refraction" out there, but I would know that it's BS when I had nothing else. I can honestly not come up with anything that I could convincingly use to argue for Globe Earth.
I still remain open to some theory where the earth's electro-magnetic field somehow causes light to bend perfectly around the globe ... but no such theory has ever been proposed, and modern science denies that light can bend except possibly a tiny amount (that's insufficient to explain curving around the globe) next to massive objects like the sun. They claim that they detected a tiny amount of light bending as it passes the sun (which they claim to be some massive body), but otherwise, light does not bend due to gravity or electromagnetism, except in tiny amounts next to incredibly massive objects. Also, if one were to revive the notion of "ether," one could propose a theory that there's a flow of ether going around the globe that causes light to move around the globe. So I remain open to new theories ... but the current theories to explain the bending of light around the globe are total crap.