Ah, but how can you possibly know whether the average person is innately stupid and incurious or whether school makes them that way?
Anyone who spends time with small children knows that before they reach school age, they are all absurdly curious about the world, and they absorb information like a sponge. I suppose you think it's just a coincidence that they lose that curiosity right around the time they start being stuffed into classrooms.
Writers like John Taylor Gatto have written hundreds of pages going through historical and psychological research to show that "genius is as common as dirt."
Your contrary opinion is actually one of the most insidious false lessons we learn in school, and it's a very useful form a social control. "See, most people are too stupid to manage themselves, you'd better let us elites make all the hard decisions for you."
And even if I grant your premise, it still doesn't support maintaining the schools we have, because they demonstrably don't work at conveying a "base level of education". They're elaborate kabuki, where everybody pretends the work matters and everybody knows it doesn't, and the average student retains almost nothing.