It's designed to push everyone into the dumb end of the spectrum. Dumb people are easier to manage by fear and intimidation.
You are totally wrong, and reactionary. I used to be a middle school teacher.
Most teachers love what they do - and they certainly aren't doing it for the money, or the adoration of the public. There's always somebody like you talking shit about them.
1) Schools have no budgets, so class sizes are up, up, up. It has been shown again and again that small class sizes help everybody.
2) Schools have been forced to teach to the least common denominator. There is a phrase "least restrictive environment", that is the rule of how kids are to be educated. For example, when I was teaching (long time ago) I had a room full of Mac Classics & 30 kids. I used HyperCard (I told you it was a long time ago) because I was teaching some kids programming, some kids drawing and a few special ed kids how to not drool on the keyboard (I am being serious) at the same time, in the same room.. Why? Because I was teaching each kid at the level they were willing & able to learn..
It's god damn difficult to teach that wide of a range of students, but the law says that little Johny, who's father beat him till he had a 60 IQ, has to be educated in "the least restrictive environment" - which means in my class with "regular" students. So that really bright kid? He doesn't get the attention he needs. Not by design, but because there's one of me. The kid being violent or disruptive? He takes priority, because he might hurt somebody or keep 90% of the class from working & learning. However, there's no real punishment for that behavior any more. So he keeps doing it every day.
It's not *designed* to make people dumb. It has been forced by lazy parents who won't make their kids behave, make them do their homework, and make excuses all fucking day about why their kid is fucking "special". Kids have become so "special" that they cannot fail in school. You can't give a kid an F, because their parents complain to the principal that the teacher is bad. If that doesn't work, they go to the school board.
The reason I no longer teach is the total lack of control teachers have, and assholes who gut all the resources - then yell and scream that the schools suck.