Paying your debts is a business decision, not a moral decision. There is nothing moral about paying your debt to a bank and nothing immoral about not paying your debt to a bank.

Businesses do this ALL THE TIME. Businesses can do this, and will walk away from debt the second when the math makes sense. If it's okay for businesses, then the exact same behavior should be okay for us humans to do. I walked away from my house at the height of the financial crisis. It was a business decision, because the mortgage was far larger than the value of my house.

Student loans are the only reason why tuition has gone up 10x in 30 years. Every financial entity from banks to schools feel like it's okay to hang students out to dry with large debts because they will have to pay for it for the rest of their lives. I hope a large portion of the debt disappears because the students simply walk away from the US.