I spent my adolescent life in private, Catholic schools in Southern California in the 90's and 00's. The percentage of kids choosing not to get an education there was at least as high (obviously we're both speculating a bit here).
That wasn't really the problem. The problem is that they got away with it. Not only were a significant number of my peers doing everything in their power to avoid as much schooling as possible, they also intentionally did so in ways that would exact the lowest penalties on their GPAs, allowing them to repeat the cycle at one of America's "fine" universities.
As an aside, in India and Brazil and other countries that are likely going to eat our lunch in the coming decades, kids act out in exactly the same ways. They did when you were in school, too, Chuck. And in India, and in Brazil, and probably when you were in Primary/Elementary school here in America, the teachers are/were allowed to beat the shit out of the students for doing so. And they still did it. The problem isn't 15-year-olds not having a complete mastery of self-discipline. The problem is a total lack of accountability which spans our entire American/Western culture.
I'm actually baffled that any intelligent person gives any credence to undergraduate degrees from American universities at this point. Anyone who can manage to take out 50-200k in loans and is sufficiently advanced in the Art of Bullshit gets a college degree in the good ol' USA. Anyone. "Didn't study in high school?" asks Santa Clara. "SAT scores not so hot?" inquires UCLA. Just go to a JC/CC for a while, and make sure to come on back and pay us whenever you're ready. We'll wait.
I see you're a USC grad, yourself. I would tell you about all the people I know who went to USC, that while some are very hard working folks and doing interesting, good work with their lives, many others are spoiled rotten rich kids (the types whose adjusted SAT scores were whatever they got plus whatever Daddy donated) entitled to a 3 day school week and at least as many hours spent playing beer pong as reading, with an unalienable right to a cushy gig "working" for one of Daddy's friends whenever they manage to get through their 4/5/6 year communications or sociology degree. Or athletes—at least most of them have some appreciation for hard work and discipline—many of whom would be better suited literally anywhere on earth but an "institution of higher education." And of course there are the cute blonde girls who had their tits done at 17 and are looking to hook up with and milk a proposal out of one of the aforementioned. I would tell you, but I don't need to. All those people went to USC when you were there, too.
This is getting long. To sum up:
The following words will mark the headstone of the Great Champion America we all think we're a part of, but in reality hasn't existed in quite some time: "A better life for my children."
In the aftermath of World Wars I and II, since our emergence as (temporarily) the world's only military and economic superpower, and the eventual disappearance of the word "manufacturing" from that very same list, America has produced nothing quite so consequential as several generations of the most entitled, work-averse sons-of-bitches ever to walk the planet earth.
…so now we're fucked.