The 'for profit' chart there is the whole story. If your business model is that you can give someone money and then force them to pay it back without any ability to discharge it, you have essentially re-invented indentured servitude. And it attracts scumbags more strongly than a half dead bleeding seal attracts sharks. We have gone through a couple of very public shutdowns as some of these for profit schools lose the…
Those are both pretty high numbers, and those are just the defaults; i.e., the worst-case scenario. It's not counting the tens of thousands of people who defer housing, defer saving for retirement, defer saving for their own children's education, or end up on a perpetual treadmill of loan payments that will destroy their ability to retire.
We are heading is the worst possible direction wrt regulation of private for-profit institutions; the available data incontrovertibly demonstrates they should be subject to more scrutiny, not less. But that's definitely not the whole story.