If you have a balance of trade problem, the traditional, and easy convenient way is to devalue your currency - its also the lazy way since it means the local national politicians do not make direct budgets cuts to programs and services.
Its much much harder to take responsibility and to make industry actually work, its much less popular with the local politicians are recognisably involved in making the austerity cutback, whereas devaluation usually takes some time to impact directly and also can be blamed upon ‘the markets’ or foreigners’ and is thus a ready made excuse for local politicians.
The Euro puts the brakes on all that, now local populations have to live with he consequences of their national spending, lack of investment, lack of modernisation and high levels of consumerism.
Greece has been especially irresponsible, in not having accurately accounts, knowing that this was the case, and yet making national plans based upon them. Add in the national pastime of tax avoidance and evasion and an EU that is complicit in this deception and you have most of the explanation you need.
Ordinary Greeks don’t have too much say in all this, except at election time when they vote for political bribery - and all of us will always vote in our own self interest - we will never vote for responsibility - not in any westernised economy.
We all like simplistic blame and simplistic solutions, but we are all in this one way or another and we all have some part of this to carry.
Germans are naturally believing they are blameless, maybe the majority of them are, but ultimately if they take their ball home, they will still suffer the end results of a Euro-crash, and wider markets around the world will take a hammering too, to say nothing of the loss of confidence which on its own can be a very major cause of recession.
The US and the far East cannot afford the Euro-zone to go down but neither of these trade areas are likely to step in if there is little credibility in the Euros themselves - in the end, Germany may withdraw somewhat, the other major zones may stand on the sidelines, and the world economy will take such as knock as to make Japan’s last two decades of stagnation look like a profit party in comparison.