How, exactly is Germany playing beggar-thy-neighbor? Especially against Greece? Germans maintain export surpluses with Greece by furnishing superior value for the money, not by export subsidies. There are no restrictions on German tourism to Greece, or other transactions with Greece. German prosperity enriches Greece economically, and infuriates their wounded national pride.
Lending money to Greeks who had no serious intention or plans to repay was foolish of the Germans, and short sighted by the Greeks, but more the fault of the Greeks, who wanted to be treated like adults, than the Germans who made the mistake of taking them even half seriously.