>So while there is a small amount of faith that some catastrophic failure won't happen, I would say its categorically different to believing things with almost no evidence.

Evidence is the key. I don't know where you stand on the Gettier problem debate (is all knowledge just JTBs?), but the Gettier problem and black swan events show that all the evidence can point to one thing, yet something else might actually happen. So, did you really know, or did you just believe? I guess flat-earthers just reject what 99.9% of people accept as knowledge and hold it instead as competing belief with whatever alternative system quacks well enough to pass as a duck in their squinting eyes.