Yes, it’s certainly difficult to imagine a bunch of right-wing demagogues rousing the rabble against a convenient “other” with insane conspiracy theories, isn’t it? Thank goodness we live in saner times.
I think you missed an I. Fiendish Astronaut asked about World War I not World War II.
The Nazis probably did blame the Jews for starting the Great War. Heck, they blamed them for everything else. And World War I really was started by a secret organization, albeit one which apparently had no Jewish members. But the Nazis would just say, “Of course there were no known Jewish members. The Jews controlled the Black Hand secretly.”