Your point about deficits (Maastricht Treaty and other EU regulations after the crises that passed), everybody ignores that but only small countries every get in trouble for it. And when it comes to deficits, Germany is actually one of lesser offenders compared to others.
Also, it has been known for a long time that an agreement when EU was being formed was made and areas of influence setup. Germany was promised to get leading influence in ECB in exchange for basically turning Deutsche Mark into Euro and allowing the whole continent to use the German currency. French got full control of the IMF, for example, and also EU parliament being located partly in Strasbourg plus more influence in some other core EU bodies outside of ECB.
Of course when the corruption was done by and was in favor of German companies getting some job, all it was well (Fraport, Siemens, subway bribing, etc).
Germany even refused to cooperate to clean things up, e.g.: https://en.wikipedia.org/wiki/Siemens_Greek_bribery_scandal
Idk, long otm calls on BundGreenInc Intl (esp since the Euro and EU has been sold as being "long europe" the past two decades, its a crowded trade), doesn't seem as much as a sure bet as selling those otm calls and using the proceeds to long deep otm puts on grasshopper trash… but everyone in the mean time will write you off as someone who wants to bring death, destruction and chaos to europe if you don't join in on their crowded trade that people aren't even buying now (because they're buying more of "Fascist inc intl" as he admits).
They also blatantly disregarded EU's and their own rules (e.g. regarding deficits) when it was for their own benefit.
There are people who, while adults, still believe in unicorns, and tooth fairies, and big nation states with huge national industries and interests looking for the good of the union and the common market, and so on. There also are pragmatists who understand politics.
If anything, the problem with Varoofakis, was that he was more of the latter.