Where is the moral quandary regarding paying back your student loans to the government that is going to default on your social security? Not only that, but the government knew what they were getting into when they bought that student debt from you. (Selling debt is often called 'taking out a loan' by people who don't understand fractional reserve banking. For instance, if you put $2 in the bank, then the bank sold you $2 of debt.) The arrangement between the student selling the debt and government buying the debt lays out the conditions for both repayment and non-repayment. It clearly says, ''You agree that X will happen if I buy that debt back from you after I finish college, and you agree that Y will happen if I don't.'' It's not like a personal loan among humans where you promise to pay it back and that's the end of it. The contract lays out the terms of repayment and non-repayment, and if the terms of non-repayment are not favorable for the other taxpayers, then those taxpayers should ask the government to stop offering such attractive conditions for non-repayment. Or... if the government is offering attractive terms for non-repayment, maybe one ought to sell them some debt!
Too many people try to apply personal ethics to these business transactions. If everyone did that, then the world would be a better place. In reality, the government is fucking you hard with the economic conditions that make selling debt your only realistic option for going to college. If you fuck the government, then that means you made money in the marketplace according to the terms which were agreed to by the government. If those terms offered by the government seem like they are fucking the other taxpayers, then those other taxpayers' grievances should be against the government for offering those non-repayment terms.
The point is: it's the government that is fucking you. It's not the people who can't afford to go college.