I don't believe we're only motivated by our own self-interests. Often out of crisis comes this enormous wellspring of generosity and motivation.
Well what would happen is that if Greece defaulted and couldn't pay its debts, all the Greek bonds that are held in other banking systems across Western Europe would suddenly have no value. You could as a knock-on effect create a banking crisis in Western Europe.
Unless confronted by an immediate, visible, or uncomfortable crisis, our nation's tendency is to take the security of the Western Hemisphere for granted.
The Western world is having an identity crisis.