> however, I'm not sold that education is the only criterion when it comes to how someone votes... or does anything else, for that matter

It isn't, however if your education or world view is superficial, you're more susceptible to right-wing talking points, like a broad spectrum "fear of ones that are different to you". But when you're more educated, more worldly, less blinkered you won't be as afraid of the other and less susceptible to a politician that They are after your jobs and benefits, and more aware that the politicians and rich people are trying to keep you down for their own gains.