You need more than just education. If people feel their standard of living is deteriorating due to no fault of their own then they become much more susceptible to disinformation. If they have to work 12 hours a day just to keep their home and feed their family then there's no room for critical thinking - you just believe whatever makes you feel better. Democracies have always struggled when the standard of living of the population has decreased - either in absolute terms or relative to their peers. And this is one of the main reasons in the US: The growing divergence in economic outlook for people living in the rich coastal cities versus the people in the "flyover states".