If only the D-Bank had been Keynesian, and had inflated the money supply, and wasted a bunch of money on make-work projects, the Nazis would never have had a chance
There was no D-Bank until after the fall of the Nazis, so (the central bank of the Weimar republic was the Reichsbank) under many logics, this statement can have a true reading, due to the failure of the antecedent in a material implication.
If the Deutche Bundesbank had leaped into the body of the Reichsbank, it would not have printed money, due to the deep seated fear of hyperinflation (caused by the experiences that lead to the collapse of the Weimar Republic). Oh Boy.
Of course, Keynes, not one to turn his nose up at the offer of a quick debauch, drew the line at currency abuse. [your punch-line here]*
Lenin was certainly right. There is no subtler, no surer means of overturning the existing basis of society than to debauch the currency. The process engages all the hidden forces of economic law on the side of destruction, and does it in a manner which not one man in a million is able to diagnose. (ECOTP, p. 127)
Come to think of it, ECOTP had such a strong effect on western public opinion that it may have directly helped grease the path for Hitler's rise.
You know who else helped grease the path for Hitler's rise? The Nazis - that's who.
* fail: "I like my sexual partners like I like my monetary supply. Quantative and Easy. "