Probably some other asshole would have taken his place.
Just as there are societal conditions that generate messiahs, Wiemar Germany was in dire need of a strong horse. It not Hitler, it would have been someone else.
I'm afraid you are right. Just look at the sorry collection of cohorts who helped him rise to power. Some of them were just sucked in by the times, most of the others helped shape the times.
One of the more interesting of the bunch was Otto Skorenzsky, the daredevil who led the rescue of Mussolini when he was deposed. Mossad actually recruited him after the war.