I think there’s an element of fear, too. The ones I’ve heard from are absolutely certain that they WILL be attacked. Someone WILL invade their home, and they will have to defend themselves. It’s not “if”, it’s “when”.
I assume these are the people that shoot someone who pulled into the wrong driveway by accident.
And the critics of Columbus WERE RIGHT! He was vastly underestimating the size of the earth. If North America hadn’t existed and it had just been one big ocean, he and the expedition would have perished in the middle of nowhere. Of course, the size had been calculated before his expedition (the actual values turned out be extremely close to what had been calculated), so he should have known better. There’s a reason he had trouble getting funding for his expedition…
I’m still somewhat frustrated that our history classes taught (maybe still do, I’ve been out of high school a long time) that all the naysayers thought the earth was flat.