I don’t know what you do about a country where millions of people believe things that are factually untrue. That aren’t even close to reality.
We’re not talking about opinions here. I mean things like: vaccines are safe and effective. This is a scientific fact beyond question — as much as anything can be. There are thousands of reliable studies of this. Millions and millions of observable outcomes. But that doesn’t matter to people’s feelings about it.
This phenomenon of not believing clearly-demonstrated facts is not unique to the right, of course. They have no monopoly, but certainly the majority of the worst of being fact-proof is now on that side.
There probably is no actual solution to this. Just me grousing. Getting rid of Fox News and similar would help, but even that would only put a small dent in the problem.