The problems the Greeks face are a lot more complicated than that. For one previous governments (ages ago) manoeuvred things in such a way that future Greek governments would end up holding the bag for their unsustainable and populist measures.

The 'austerity' policies you put between quotes hit the regular Greek population where it hurts and meanwhile do nothing whatsoever to really affect the future of Greece in a positive way.

To see the problem in financial terms applied today only is to miss the wood for the trees, this problem goes back decades.