There are plenty of loans where the original principal is never recovered to any reasonable amount and the vast majority of the loan is forgiven. It's literally how debt collection works, mostly attempting to get SOMETHING from the original debtor.

Forcing full repayment is absurd, and known to be by just about every reasonable person who's looked into the economics of loans. We figured out debtors prisons were also stupid a long time ago. There's plenty of alternative measures, and the whole reason things like bankruptcy exists is because we recognize it's better than financially nuking someone.

Or do you think we should also make medical debt unforgivable since you can't rip the kidney back out?