Voters were not really looking for anything very concrete from the Nazi Party in 1930. They were, instead, protesting against the failure of the Weimar Republic. Many of them, too, particularly in rural areas, small towns, small workshops, culturally conservative families, older age groups, or the middle-class nationalist political milieu, may have been registering their alienation from the cultural and political modernity for which the Republic stood, despite the modern image which the Nazis projected in many respects.
This seems akin to today's "protest" or "anti-system" votes for Trump or for Brexit. Kinda chilling, to be honest.
