So why did the Nazis perform so strongly in 1930?
As paradoxical as it sounds, it might be for the same reason that voters turned away from the Nazis in 1928: its propensity to violence. Ever since Hitler had been in the NSDAP, he had talked about one thing: executing his political opponents. And the Nazi party remained absolutely consistent in that respect. In the run-up to the 1930 vote, it didn’t talk about social policy, it didn’t talk about building the autobahn. It just had murder plots.