For my entire twenties, I could have been one of your friends complaining about the burden of my student loans. Nowadays I complain about the burden of my mortgage. But in both cases I got loans for valuable things on very reasonable terms. Just because I feel personally burdened does not mean it's a crisis for society.
It also doesn't mean nothing should ever be done. Personally I think income based repayment is a great policy. Maybe we should make that more generous for its current beneficiaries can't afford housing or families at its current level (anecdotally that wasn't the case for my friends who took advantage of the program, but it's a statistical question and I don't know the answer).
But many people seem to act like blanket forgiveness is the only workable or fair policy, and I'm just not convinced.