All Hitler had to do was let the communist/anarchist factions (useful idiots) do the heavy lifting.
That seems to have been felt to be quite convenient by German state and local authorities ~ the very sort of behavior we saw with mayors' coddling "Occupy.....".
Imagine, Hizhonor, Mayor of Nyork, Bloomberg, behaving just like the mayor of Frankfort (e.g.) during the Weimar Republic period. Oh, my goodness!
Still, so expected, and so typical.
Contrary to the false belief of so many modern people, Hitler and his Nazi party didn't walk into a vacuum all by themselves. That's just the street theatre part. They took over a nation given to brutal solutions to minor issues ~ and fit right into the parts prepared for them.