When I was initially on an IBR plan I was paying roughly 3/4 of the interest that was accruing every month. Do you have any idea how soul-crushing it is to make less than $30k a year, make payments in the multiple hundreds of dollars every months, and see the balance increase?
After 20 years of that, I think you deserve the forgiveness. But not only that, you're then taxed on the forgiveness (which I think is necessary!). So you struggle for 20 years, still have the debt, then get nailed with what could very well be a 5-figure tax bill.
Under most circumstances they have probably paid more to the federal government than you have.
Screw all those freeloaders!