It is a patent nonsense to suggest that Greek debt is their fault alone

The banking system has a crisis that had nothing to do with the Greek state, even if it led to the revelation of how dysfunctional the running of the state was and is.
But the cost of that wider banking crisis and the consequences of a dysfunctional Greece are both being borne by the Greek state, when only the cost of fixing the dysfunctional state governance should be borne by them.