The growth of this kind of stubborn ignorance in the midst of the Information Age cannot be explained away as merely the result of rank ignorance. Many of the people who campaign against established knowledge are otherwise adept and successful in their daily lives. In some ways, it is all worse than ignorance: it is unfounded arrogance, the outrage of an increasingly narcissistic culture that cannot endure even the slightest hint of inequality of any kind.
It’s one thing to not believe what science is telling you. It’s an entirely different thing when those actions endanger others.