In 1918, Germany transitioned from a semi-authoritarian empire to the Weimar Republic, a democracy that protected individual rights and limited police power. During the Weimar Republic, police struggled to respond to a rise in crime, political violence, and high unemployment. The Nazis promised to fix these problems, which helped policemen to eventually accept the new Nazi regime in 1933.
Also “the nazis promised to fix the political violence” - THAT THEY THEMSELVES BROUGHT ABOUT.