Who do you think caused the Roman Republic to become the Empire, then?
I haven’t studied it in depth, but I imagine there isn’t any single reason or group of people. There usually isn’t.
(also, don’t you believe in a conspiracy by the government to blow up the twin towers and by Jews and other groups to “cover up” the truth of the supposed non-Holocaust? You don’t have to answer though, I suppose these questions are extraneous)
(also also, just to be clear, a “behind the scenes conspiracy” that simultaneously “had the support of the majority of Germans” would not be a conspiracy.)