The people struggling to repay their loans are those that have degrees with little or no economic value.
The main criticism from blue-collared voters on student loan forgiveness is the moral hazard of allowing students to take out loans for degrees with virtually no economic value. Of course, this criticism was completely ignored by the college educated elite whom refuse to entertain the idea a degree needs to have a measurable ROI. There are many other factors that play into this, but this is the crux of the matter.