Well we all carry the burden and misery, some of us simply were strong enough to not be particularly affected. And when one rides out a storm better than others, you are more easily capable of starting anew at the expense off others.
As for defaulting and leaving, Greece would essentially be no better off, because strangely enough fucking over trading partners and neighboring governments, tend to effect your capabilities of trade, deals and all those things that are positives to a growing economy.