When you have a simple world view, nuance is always going to escape you. An educated person can understand that the world isn't simple, which will lead to a more liberal view, as liberal views tend to be based on the assumption that angry, narrow world view responses aren't a good thing. Someone who sees things in black and white, ignoring the complexities of life, will respond with simple, ignorant answers.
Examples: climate change denial, anti-vax, religion... They're the intellectual equivalent of sticking your fingers in your ears and shouting, rather than seeking to actually understand anything.
It's worth noting that all these things are driven by fear of things people don't understand. Someone who understands how vaccinations work, why we do them, why they're made the way they are can't be afraid of them, and thus won't be against them. But most people aren't in that camp, which opens the door for people to make bad choices.
It's hard getting people to be want to be informed and right, when it means they might have to disagree with their social group.