Why? Greece obligated themselves and now they say they don’t want to pay???
I am of two minds on this. The Greeks down the years have been remarkably improvident with the public purse. However much of the “bailout” is not directed at “saving Greece” or helping Greeks in any way but at avoiding making those bankers, investors, bankers, other governments, oh, and did I mention bankers? foolish enough to have lent vast sums of money to improvident Greek government take a haircut on their bad investments. Should Greece repay its debts? Yes, but quite frankly, if you were stupid enough to lend money to Greece, you deserve to be paid back in new drachmas that start out nominally worth a Euro, and will promptly collapse in value down to a level that will make a Greek export and tourism economy based on cheap labor viable.
I think this idea is part of the "economic" democracy rage that is sweeping the left these days. If you want something, just vote for those who promise what you want. Then, like magic, all your dreams will come true with somebody else picking up the tab for the whole party! It's really great! If EU goes along with it, Spain is lurking in the background with an order of magnitude larger list of things they want.