The real problem is that secondary education is becoming unaffordable for a large segment of the population. And that has happened for a host of reasons - a squeezed and shrinking middle class, increased costs for running a university, reduced state and federal funding for higher education, among other things - all of which are considerably more complicated to solve than "but what if we just loaned them money at high interest rates to put them in debt for life?"Is waiving loans for those who could partially
or fully repay them really making society better?
The loans shouldn't even be a thing. They shouldn't be needed if the state and federal government did its job of supporting higher education for its citizenry such that the cost of attending college was more or less negligible, as it was in the not so distant past.
As for whether or not a well-educated citizenry makes for a better society, "better" is always a subjective assessment and value judgement. But if you want a modern, Western democracy and republic that has any chance of sustaining itself and being functional (or even competitive, if we want to get all capitalist about it), a well-educated citizenry is an absolute must. Supporting education at all levels is an absolute must. Along with other super obvious things like supporting the health and wellness of your citizens, providing necessary common infrastructure like roads and electrical grids, ensuring adequate food supplies and combating food insecurity regardless of state and location, etc.