We all know confidently incorrect people. People displaying dunning-kruger. The majority of those people have low education and without someone giving them objectively true feedback on their opinions through their developmental years, they start to believe everything they think is true even without evidence.
Memorizing facts, dates, and formulas aren’t what necessarily makes someone intelligent. It’s the ability to second guess yourself and have an appropriate amount of confidence relative to your knowledge that is a sign of intelligence.
I could be wrong though.
Education, done correctly, doesn’t teach you what to think but how to think.
Expanding on this, it shows you some basic options/pathways on how to think.
For me it was more like learning how other people think. Like, I took an accounting class as an elective and while it didn’t make me an accountant but it helped me understand accountants.