Thing is, not all these people have less than two braincells to rub together. It's like flat earther's. Not all of them are stupid people. Maybe just never got taught critical thinking until they'd already been indoctrinated in some religion (evangelical Christianity usually, but not always.) Or grew up before the internet, and so fell into the echo chamber trap. Or their parents only watch Faux News and so that's what they watch.

Calling all these people stupid isn't really fair. I know stupid people who think all that shit is ridiculous.