Multiple reasons, but it starts with terrible education. They don’t know how to verify information at best, and at worst don’t want to, they believe they win when they piss off someone they don’t like. This means the information they get on current topics is generally something pushed by someone either paying an algorithm to target them or by things like AstroTurfing.

There’s a lot of value for the hegemony class in getting people to not care about the climate, endless war, genocide, and human rights in general.

And then you have the out of touch authoritarian liberals/neoliberals that control the liberal side of the mainstream media.

Most Trump voters I have come across don’t actually know what fascism is, so the insult dosnt work. They still believe they are voting for small government and lower taxes, they are in a delusion and they can’t believe otherwise regardless of what I would call facts.

Trump voters are quite practiced at mentally cherry picking what their dogma is in their religion, so for them it’s not as much of a stretch.