Summary: People believe in the truth of ideas that don’t withstand even casual empirical scrutiny, e.g., that American police kill more black people than white people every year. Why do so many of us believe in and even defend vehemently the validity of bogus ideas when contrary evidence is easily found?
You can find many examples of this kind of thing in Amazon reviews of controversial books such as Democracy in Chains by Nancy MacLean:
The respective authors of the five-star and one-star reviews appear to inhabit separate factual universes. In one universe James Buchanan was a distinguished laissez-faire economist and originator of public-choice theory. In the other universe Buchanan, the Koch brothers and other prominent libertarians were members of a racist conspiracy. How can people on one side of a controversy remain ignorant about the other side’s arguments and even basic facts?
AVI suggests possible explanations that are worth reading, as always. I think the main problem is the poor quality of our primary and secondary educational systems, particularly in the teaching of history, math and basic statistics. Another big problem is the ignorance of journalists who were educated in our lousy schools, and modern journalism’s clickbait business model that incentivizes the promotion of controversy and conflict even more than was the case back in Front Page days.