How much of that 'debt' is due to off balance sheet transactions most which have been written with the sole purpose of disguising the financial condition of Greece or otherwise deceiving the public?
Should Greece taxpayers pay for the 'clever financial engineering' of the vampire squid and others?
Is the most obvious answer deceiving? This is the classic Occam's razor problem.
http://en.wikipedia.org/wiki/Occam%27s_razor
I am not trying to defend Greece, but i am aware that even Germany has defaulted on occasion(s).