The class stratification in society is absolutely intense, if you're coming from a bad family you just need to get away from them as soon as you can. I made the mistake of not estranging myself from my own family much sooner. If I could change one thing about the way America works I'd eliminate the requirement for parental involvement when it comes to getting financial aid.
If your parents like to beat you up, you should be able to just walk out when you're 18 and get help to go to school. But that's not the system now. Aside from a small handful of exceptions which are painfully difficult to get, you're basically on your own. I think in Europe everyone just gets help to go to college so this isn't an issue there.
I agree that most students who got to college don't make good use of the time or investment, but it is still a minority of people who even attempt college.
https://nces.ed.gov/programs/digest/d18/tables/dt18_302.60.a... https://nces.ed.gov/FastFacts/display.asp?id=40