Totalitarian or authoritarian systems are based on the idea that some people know the truth, and through forceful authority will organize society around their knowledge. People have versions of the truth of varying quality and functionality, and to the extent the model is true and functional, it will work. These systems aren’t great but they at least sort of work, usually.
Modern America is unique in that its leaders don’t think they know the truth, but that they can create the truth, that what people believes becomes true. Keynesian economics and modern race relations wouldn’t seem to have anything in common, but Keynes believed that if people thought the economy was good, it would be good, and liberals believe if the people believe blacks are nice and smart, blacks will be nice and smart. They don’t believe these things are true, only that they should be true, and if people believe them they will be true.
People who believe in objective reality can deal with facts in some kind of rational way. They can accept the theory doesn’t match the facts 100%. If they can’t, they are at least just crazy. To believe something that doesn’t match reality and refuse to change your beliefs is a good definition of crazy.
To believe that reality is malleable, that it is based on a mass hallucination is not even crazy. But that is what modern American liberalism is.