Rave it is because in 70s the worlds elite decided no nation should be allowed to default at all costs. Hence the constant remortgaging, new money paying off old money to keep the champagne rolling. Lenders know the countries cannot afford to pay it back. Paper clippers.
The Greeks should give serious consideration to defaulting or debt moratorium for 10 years to get their house in order. Keep their national infrastructure under their own control. Utilities, telecoms for the time being etc. As they say owe a bank 1 million it's your problem, owe them 10 billion, it's theirs.
Greece needs to work towards a more accountable government. Transparent so that they don't get this situation again and leave their grandchildren to pay for it.