A systemic Eurozone breakup would be the mother of all financial crises. This column – a rejoinder to Hans-Werner Sinn’s recent column – agrees that Germany would lose massively from a breakup, but argues that the ultimate source is the €600 billion current account surpluses it ran with other EZ nations during the good years, not the TARGET2 system. German banks lent vast amounts to peripheral countries without doing a proper credit analysis. No one other than Germany itself is responsible for taking on these risks.