Around that time so much fundamental stuff changed at once in the Europe.
In 1913 there was one square kilometer in Vienna where Freud, Jung, Hitler, Trotsky, Stalin and Tito lived. Hitler and Trotsky were regulars in the the same cafe. Then there was WWI. Albert Einstein was becoming famous, quantum mechanics was being discovered. Einstein and Henri Bergson debated 1920 in Paris.
https://duckduckgo.com/?q=ernst+barlach&t=iphone&ia=images&i...
One point that stood out to me was the low level street violence amongst the various factions - communists and fascists - which meant that both sides had readymade, active militias. And the unaffiliated ultimately siding with the law and order group looking to make Germany great again.
Of course, had the communists won out, we may have seen another Stalinist type country, as that was the popular strain of communism at the time...
There were definitely right-wing militias in the period you're talking about though. Just not what we'd call NAZI or fascist.
It was nationalist right wing militias that killed Rosa Luxemburg and Karl Liebknecht (Spartakusbund)