So Greece was able to spend way beyond what they produced.
For a while.
There was never any way this could go on indefinitely, spending had to come down at some point, because you can't spend more than you take in in the long run - so called "austerity". And that's even without taking into account that you usually have to pay back debts.
The fact that this hits the little people rather than the tax-avoiders at the top is an internal Greek problem.
Although they should not have been admitted to the Euro, leaving it now would not improve things: their debt is valued in Euro, so if they return to the Drachma and then devalue their currency, their debt goes up even more!
Of course, they should never have been admitted to Euro, and it turns out that the so-called Euro crisis (which is yet another banking crisis) was precipitated by Goldman Sachs letting slip that there was "something fishy" with Greece.
How did Goldman Sachs know this? They were the ones who had cooked the books for the Greek government in order to gain entry to the Euro.
IMHO, the EU should seize Goldman Sachs assets in order to pay for the Greek bailouts.