Cote Greec has spent more than 50 of the past 100 years repaying debt and running a deficit. For most people under the age of 50, that looks damn near like forever.
There are many problems. Firstly Greece is a socialist country that believe everyone is entitled, and other people should pay. Much like the socialist ethos in every other welfare state in the world.
Secondly, they cannot be allowed to default on their debts. A default triggers payouts on credit default swaps and derivitives, which no-one can pay anywhere in the world, so any failure to pay must be swept under the carpet and mopped up by either rolling it up into even more debt and kicking the can further down the road, or taking in onto the books of the IMF or ECB, collateralising it, moving it off balance sheet, and effectively writing it off.
Of course no-one actually loses any money here at all. This is not real money. It is artificially created digits in a computer system. The hurt to the people of Greece is purely political. It is a way of the greater entity punishing the political class of the weaker entity, by punishing its people.
And, no. We as a people have no obligation to moral duty to bail out pensioners in Greece. It's not like they haven't known for more than a decade that their country is bankrupt. It's not like they haven't known for more than 40 years that they have been living well beyond their means.
Let's get our own house in order first. Or just continue to pretend it couldn't happen here if that works for you.