I'm not entirely sure of this 1:1 relationship of intelligence/education to bad political ideas such as Bolsonaro's.

There is a lot of ideology involved, which correlates rather poorly with intelligence. There are, for example, quite a few Republican politicians that aren't obviously stupid, who still spent decades denying first the existence of climate change, then the human contribution, followed by the risks and, finally, our ability to act against it.

Other example: when people say "Barack Obama was not born in the United States" it is not intended as a statement of fact, which is why no amount of fact-checking and birth-certificate-producing stopped people from engaging in that particular conspiracy theory. It is an expression of ideology.

And because every comment on such topic must end with George Orwell: In 1984 the highest achievement of ideology is the expression of facts that are obviously wrong.