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Nit-picking. It's more or less immaterial, at what point the turd was laid in the punchbowl; at some point after the prerequisites were in place, a dominator culture came along and dominated. Whether the final nail in the coffin was Sargon of Akkad, or the East India Company, the problem is the same.
What is the recipe for preventing a dominator culture from getting its genocide on, without opposition from a similar culture?
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I am trying to make a serious recommendation.
The historiography you are describing (an arc of history that progresses from egalitarian hunter-gather bands through the agrarian, feudal, industrial and information revolutions to ineluctable dominance and hierarchy) is painstakingly debunked by Graeber and Wengrow. They persuasively argue that this historiography is an invention of the enlightenment, arising from the indigenous critique when Europeans encountered the people of the Americas.
You would get a lot out of Graeber if you took the time. The exciting thing about his message is that there is nothing preordained about our social relations and we are free to reinvent them, as people have done throughout history.
Or not. Now go and read The Dawn of Everything.