Abstraction. They can't see how a functioning government benefits them. The only people who need a functioning government, in their mind, are the leeches and welfare queens, not the hard working rugged individuals like them who have never taken a penny in government aid (again abstraction. Tax policy that subsidizes mortgage holders, for example, does not occur to them as a handout. Or social security. It's not a handout because "I paid into it", not considering that they get back more than they contributed).
Makes sense. But why is that? Are they not educated enough to realize it? Or don't they bother to apply their common sense to such topics? Also, where do they get these weird alternative explanations from?
PS: I'm not from the US. What I know is from both mainstream and social media. I'm curious about the fundamental reasons on the ground too.