It's because these extraordinarily stupid individuals started out with the same shitty American k-12 education as the rest of us and then went out of their way

It's because these extraordinarily stupid individuals started out with the same shitty American k-12 education as the rest of us and then went out of their way to make it worse by believing things that are patently false. Someone unable to grasp the basics isn't worth getting into a technical discussion with. There aren't many of these 'basics' that I would consider an instant DQ, although Holocaust Denial, Being Superstitious, Cannibalism, Flat Earth Belief, etc. would fit the bill.