I think this is an important insight. Nazism wasn't just some loopy philosophy that suddenly appeared out of nowhere. Fascism promises a community unified around a set of political ideals. It promises to end the wrangling between Left and Right, and promises a "third way" (or, 'middle way'). It looks back to a golden age when the community was not beset by foreign ideas, and people, and turbulent events, all of which the Weimar Republic had in spades. A strong, unified nation with an inspired leader at the top to articulate the will of the people; make the hard choices. This is a very appealing philosophy in times of great stress, and lurks just below the surface