Consider my post from last week.
If you accept that a significant number of voters are honestly insane, it starts to make more sense. Literally millions of Republican supporters cannot see the actual facts in front of them, because they are fundamentally irrational and delusional. Millions more can see the facts, but deliberately chose to ignore them because of some fantasy they have about how the world works. This behavior is not normal.
Alas, I have no idea about how to fix a level of insanity this great.