West Germany did repay some of the defaulted WWI debt to help rebuild their reputation after they lost WWII.
Also, there is another gigantic difference here, Germany lost a bloody war and we told them how it was going to be, we restructured their economy, wholesale, and they were in no position to disagree. About half the debt was forgiven because they did what we made them do. If Greece wants to put their sovereignty on the table and let their creditors structure their economy for them, that's a very different negotiation than what they've had. Further, the west wanted a strong Germany between them and the communists, what's Greece got to bring to that table?
All this hypocrisy talk misses the point. Greece should go elsewhere to finance their debts if they don't like dealing with Germany. With their history, lifestyle, economy and government, I think that will be a challenge. Nothing prevents BRICs from investing there, they just don't seem that interested. Nations aren't individuals but try to go negotiate with a pawn shop or payday lending place, it sucks to need money and not have options. Sure, Germany has defaulted in the past, Greece can crap on then when the tables are reversed...