In other words "I have no answer for that, because that would prove beyond a shadow (pun intended) of a doubt, that we lived on a flat disc.
It's not fear, or conspiracy, it's just the application of good old common sense, with a heavy dose of science and knowledge.
But hey, I'm not going to stop you believing in whatever the hell you want; shit, write books about it, make internet videos, and I'll just get on with believing in reality and you can carry on believing in your reality.
Seriously though; you're not serious are you? You don't really believe we live on a flat disc do you?
On second thoughts; don't answer that :-)
Cg