You formed a union with your neighbors to work within a single financial system and a single currency.  You are all mismanaging it together so you should all pay together.  Not only because you all caused the problem together (so you deserve to share the loss), but because if any of you go down you all go down.  You don't have to like each other, you just have to keep each other afloat when things get bad.  If you didn't want to pay for things like this then you should not have set up such an insane arrangement in the first place.