Things were going fine before bushanomics was implemented. Or reaganomics. Also notice the debt doubled under them too. This is happening all over the world. This is not an American or Greek phenomenon its divide and conquer. If we accept your premise in Greece or America then we are saying that poor people are what ruined the economy and we all know thats not true.Some perspectives (without the usual partisan slant):
1. Greece's population is less than that of Ohio
2. Greece's GDP is about that of a large US city such as Atlanta or Miami.
3. The interest rate levied by Germany and France's loans to Greece borders on usury.
4. Having such countries as Greece, Portugal and even Spain be part of the EU based on their GDPs, was more of a political scheme than an economic one.
5. After all the sabre rattling, a deal will be reached between all parties involved for 2 main reasons: Debtors would lose big if Greece completely defaults (a-la Argentina) and the EU does NOT want Russia to court Greece into its fold.
So the lesson is that Socialism fails irrespective of the size or population of the entity that tries it
Do poor people in Greece and America contribute towards the debt? Of course, but its so much more than that.
Why did we turn the federal reserve over to private bankers in 1913? Do you want to go back to the gold standard? Do you want to stop borrowing from china? Do you want to stop spending so much on defense?