It used to be limited to professional wrestling and the National Enquirer segment of supermarket tabloids. But conservatives needed the stupidity industry to grow and they had proof in its small early success that spackling over the face of propaganda with entertainment would work, so they made it happen.
Now Republicans believe whatever is politically convenient, and damn the facts.
A few years ago, Republican voters, by and large, believed what the mainstream believed when it came to climate science. Then their party, its candidates, and its media outlets told these voters to stop believing the facts -- and rank-and-file Republicans did as they were told.