Most people do not naturally develop an advanced political education by themselves, they've got their own lives to deal with. A peasant could not hold their own in a complex economics debate with a King because they weren't even taught to read nonetheless learn the intricacies of Middle Age politics.

There is a similar thing going on in the modern world, where sure most people can now read but only the capitalist class for the most part gets to access the highest levels of education. And without the tools to see beyond your cultural norms, to analyse whether they are right or wrong or being lucky enough to be born with the right brain to see past it, what can you even do?