The fundamental relationship of capitalism, i.e. capital owner employing people to work for him and make him money, is quite toxic. No wonder it seeps into the workplace relationships.
The important question is where you draw the boundary line for the conflict. These groups are fighting together against the environment, whereas we are both fighting the environment and against each other (in capitalist system, everyone is competing with everyone else all the time). Hunter-gatherer tribes basically implement some form of socialism, with little to no private property and cooperation instead of competition.