That exchange hints to the reason why the type of debt cancellation the OP is suggesting CAN NOT work. debt is debt is debt. No difference is not entirely true... There is PRIVATE debt, and there is PUBLIC debt. OP wants PUBLIC debt cancelled.
Public debt includes government agencies and programs, in addition to certain non-governmental entities with government oversight, many of which are mandated by law, to purchase government (public) debt. So what happens to pensions (and pensioners) for instance? Note, I did not say social security(USA) or any other government provided "safety net" or assistance. But if those debt behemoths are not included than what would be the point? Selective public debt cancellation, yea, that'll work to reduce the debt. LOL. Selective or complete, don't forget the ripple effect of all the debt derivatives, worldwide, and those affects and peoples.
Private debt IS completely different... I owe you 100K. Forgive my debt, and I will forgive others. MUCH different.
On a side note... I'm pretty sure usury(interest) is taboo in the Muslim world. Usury has roots in the bible and I seem to recall, the monks. Could interest be forgiven? Could interest paid be applied to principal? I am not an expert on the subject, but I know just enough to be dangerous...