Most people were Nazis in Germany because it got them a job. A lot of it was economics.
Edit: I am not excusing why they were Nazis. Does not matter why they became a Nazi or why they supported who they did. A lot of "common/average" Nazis beliefs started with economic reasons albeit at most times flawed and twisted logic.
Originally the retohric to elect Nazis was to blame the disabled that were a drain on society as well as the communists and leftists that were ruining the country.