Finding an exception to the rule and then claiming that exception is the rule is kinda wild. The vast vast vast vast majority of human beings do NOT engage in exploitation of each other. As such I do not believe exploitation is a part of human nature but is rather a manifestation of anti social behavior intersecting with the material conditions of the time. Humans are egalitarian and communal by nature, things that pull us from that are aberrations to our nature not pillars of it.