Beyond this, the entire point of higher education is to push those who are able to higher levels, not to drag the 75% along for the ride.
Who do you think produces all the value in the world? It's not the people organizing the labor, it's the goddamn laborers.
> Do you think you'd have the internet or iPads if everyone was capped to the 75th percentile? No.
What do you think we would be eating if we left the world up to the rich nerds? We would have starved many millennia ago.
Advancing humanity is coming up with cures for disease, or inventing useful things. We manage to feed the world with a fraction of the labor it once took to do so. It wasn't the common laborer that came up with solutions that effectively eliminated food scarcity.
Maybe if we actually held kids that can't do the work back, they wouldn't be illiterate. Let social pressure do the work it's meant to. For that matter, let parents do the work they're supposed to.
Sorting into better highschools and worse ones, and better classes and worse was done even back in my times, in what used to be yugoslavia, with communism, red stars and a dictator. You want better kids to excell as much as they can, and you want the stupid kids to at least learn to read and write for their boring communist factory jobs for the next 40 years, even if they never get to learn how to solve differential eqations... if you keep the kids together, the stupid ones still won't be able to do basic math and there would be no time left over for the smarter ones to learn more. There was no correlation between money and stupidity of kids.
Some kids are smart enough to become engineers, some can barely read, there's no need for them to be in the same classroom.