The left is defined as putting the collective state first, while the right is defined by individualism before all else. The extreme right eventually advocates for leadership and control by the "superior" individuals that rise through that individualism, which is essentially the belief that it's the strong's right to rule, regardless of whether you define strength to be wealth, intelligence, social clout or otherwise. The extreme left eventually advocates for the total supremecy of the state, seeing any level of social deviancy as damaging to their collective society. These are tankies: the "states can do no wrong" crowd.
Unfortunately, both binaries of the political spectrum are prone to authoritarianism once you go far enough. It's almost like the real issue is extreme ideals that leave no room for nuance and understanding.
I used to consider myself extremely radically left, before I stumbled across the absurdity of the Tankies that permeate certain areas of Lemmy. And I mean, as far as Western politics is concerned I am absurdly leftist. Just not that kind of leftist