I had a friend go to a Community College and he had that as an issue and also he just didn't get certain concepts in later maths.
But there are people who decide not to go to college for this reason and they would still have to pay in through taxes.
Heck, if your friend went to a CC, their debt should be practically nothing compared to others.
Also to point out, taxes are collected to benefit everyone, regardless of reason.
Though reading up more on the rumored plan, 125k threshold is still a bit high, anyone making that much should be able to pay off any debt. If biden pulls the trigger, it needs to be a lot more regulated, more under those who don't make more than 50-60k a year, forgive only the money spent on classes and make sure no one comes from a wealthy family setting.