Anarcho-communist movements do exist and actually work.

They also get continuously assaulted by militias and law enforcement departments financed by plutocratic interests.

Our oligarchs aphave shown they'd sooner scorch the earth than give up their power and become one of the commons. In fact, they are literally doing so.

Our species just may not me into massive cooperative states, until we figure out a sociological trick to get the to favor lifting everyone (including themselves) rather than being satisfied they can kick at lower rungs of the hierarchy.

But we really like dominance hierarchy and are glad to perpetuate it from schoolyard bullying to tribal genocide. Our primal drives to other and kill each other is currently beating out reason. My own hope is skeptical.