Euro countries can't do that.
Well, they can, they just have to all agree to do it. The problem is that Germany and France don't want to experience the potential currency devaluation that would help Italy and Greece, and the central bankers that run the Eurozone are primarily from those nations.
The emerging problem with the world - and the US is no exception, here - is that we've separated the power necessary to solve problems from the responsibility to actually solve them. Obstruction rules the day.