Totalitarian systems call on their members to defer reason and judgment in crucial areas to an expert class. Those swept up in the mass formation are convinced to place their faith not in God or religion, but experts and science. Just like with religion, this new machine messiah demands sacrifice and a subordination of will to itself.
Mass formations depend upon fear to exist. As long as people can be made to fear something, a totalitarian system can be established and maintained.
Unlike a dictatorship, the head of a totalitarian regime is an ideology. That makes it very hard to end the regime by simply toppling its titular leader. You must discredit the ideology or subsume it with another one.
This goes a long way towards explaining the kind of vitriol and condescension so prevalent on the left nowadays towards anybody who refuses to go along with them. This explains the steep rise of authoritarianism, especially in the West around COVID and climate-change.
The Left is highly motivated by fear, and they fear a world in which they are not in control they will be victimized by those who are. This is driven by the Marxist belief that all power imbalances between people result in a oppressor/oppressed relationship.