I see the pattern you're talking about but - I not sure I agree with your analysis. Both right and left extreme ideologies go towards
authoritarianism/
totalitarianism if you look at it in a 4 square model with left/right authoritarian/liberty axis.
Fascist states specifically opposed socialist/marxist ideology and the idea of a classless state was opposed by fascists who believed in a strict and natural social order. That produces very different propoganda. The propoganda the fascists fed their people which united them - was opposition to communism (the so called "creeping sharia" of that era) - fear unites and makes excellant propoganda. The Soviets did the same with their anti-western propoganda and added a bit of the Russian persecution complex (everyone is out to get us) for flavor.
How Fascism Works
- Survival of the fittest: Some fascist philosophers were influenced by the writings of Charles Darwin and his theory of natural selection. In the context of fascism, the State is only as powerful as its ability to wage wars and win them. The State is thereby selected for survival due to its strength and dominance. Peace is viewed as weakness, aggression as strength. Strength is the ultimate good and ensures the survival of the State.
- Strict social order: Fascism maintains a strict class structure. In this way, it's the antithesis of communism, which abolishes class distinctions. Fascism believes that clearly divided classes are necessary to avoid any hint of chaos, which is a threat to the State. The State's power depends on the maintenance of a class system in which every person has a definite, unchangeable, specific role in glorifying the state. It's an absolute rejection of humanism and democracy.
- Authoritarian leadership: The State's interests require a single, charismatic leader with absolute authority. This is the concept of Führerprinzip, "the leadership principle" in German -- that it's necessary to have an all-powerful, heroic leader to maintain the unity and unquestioning submission required by the fascist State. This leader often becomes a symbol of the State.