@Belisarius II do you think these underlying trends, values and attitudes pre-dated even the First World War? I mean, were they already there during the Imperial German era?
Yes many of them were. Racist, anti-Semitic, Eugenicist, and hyper nationalistic thinking were all on the rise in Wilhelmine German. Similar isms were also on the rise in other Western Nations, with strong Eugenicist movements in the United States, and Britain, which Dr. Goebbels credited with inspiring their racial "Hygiene" Laws. These screwy pseudoscientific theories became very popular in Germany, as a justification for intra White Racism, against Jews, Gypsies, Slavs, Magyars, and other minority groups in Germany, and Austria.
Pre WWI Germany suffered from a strong national sense of pessimism, that their culture was in decline, and that only a nationalist revival could reverse the decay. Many authors, and professors of the day reflected this in their writing, and lectures. The desire for a much stronger national leadership then the current regime provided was very strong, and many already spoke of the need for a Fuhrer to represent, and defend the true interests of the German Folk.
The Germans also had a feeling of being surrounded by enemies, beyond just the Franco/Russian Entente, to Britain, America, or any other power that might deny them their "Place in the Sun". The sense of national pessimism extended to fears they were going to be overtaken economically, and militarily by Russia, and other powers, This led to more aggressive thinking, that they had to strike their enemies first while they still had the chance. This prevailing mindset led to the General Staffs determination to launch a preemptive war against Russia in 1914. Oddly this "defensive" preemptive war on Russia would be based on a Balkan pretext, and via an invasion of Belgium, and France.
Defeat in the Great War only intensified all these tendencies, and added more fears. Socialist revolutions in Germany led to the rise of the counter force of the Right Wing Nationalists, and the Freikorps. Ethnic battles with the Poles, refugees from Soviet Russia, hyperinflation, the humiliation of Versailles, and the "Stabbed in the Back" Theory, and you half way there. Add in a rejection of Liberal Democracy, and cultural progressivism, and your 75% to a Right Wing Nationalist regime. With the Great Depression as a final catalyst, you have Red Front, SA street battles, and the writing is on the wall.