Humans: the first massively cannibal species.
In fact, most developed mammals develop societies and specially in many apes these are quite egalitarian. In the same way as developing tools and understanding nature in order to adapt to it was key to the success of humans, I believe that the ability to cooperate and to feel for each-other via empathy is key as well.
Your mechanistic view of evolution and nature disregards all social aspects of human existence. It is unscientific and and excuse to support oppressive systems and the predatory behaviors that are putting the planet and humans themselves at risk.
Nature does not "disrupt", nature adapts and evolves. It creates symbiotic systems that enable long processes in which life, this weird mechanism constantly energy into movement, can happen. It created humans, with the abilities to discern, associate, help each other and pursue happiness. Your cannibalistic view of society is not gonna remove our "natural" thrive to build societies worth living in from the rest of us.