mathsanxiety ..... I'm not quite sure how this example that you include "Argentina knows full well that this case will get nowhere, but used the opportunity to castigate the US, and rightly." is relevant to the FACT that countries DO default, the Greek problems are not, as claig would like us to think, as rare as rocking horse pooh.
Re your "How many times do entire countries have to default before banks sit down and do a little thinking?"
I will assume that you are talking about Investment Banks.
How do you think hundreds of millions of people globally were brought out of economic poverty, going to their local post office to raise billions of local currencies or U.S. dollars to kick start growth?
Whether using supranational organisations like the World Bank or Asian Development Bank etc or DIRECTLY, these emerging counties originally rated low investment grade down to junk, were able to tap international investors for far from risk-less money, VIA a key functionality of Investment Banks.
Look I can't be arsed to lecture on how Investment Banks daily make the worlds economy goes around, as most people now realise after September 2007 that when they DON'T function, bad economic things happen.
My point is, whether Argentina, Russia, or even Greece, the Investment banks just raise the money that the elected governments of these countries ASK to be raised, now what the numb-nuts DO with the money once raised, IS DOWN TO THEM.