The human propensity towards violence has been evolved because violence increases survivability. In order to eat, there must sometimes be acts of violence committed on other living things, be they prey or other humans looking to steal food/mates or kill.
This evolved propensity towards violence, I've learned, is the root of civilization and technological superiority and advancement. Without it, humanity would not be the apex predator on this planet and we would not be having this conversation over digital space. This drive to conquer - rooted in selfishness and survival instincts - is what allowed humans to reach out to space and to split the atom.
As much as I would like to alter human evolution and steer it towards a path of absolute pacifism and full on cooperation instead of competition, doing so would doom the species to extinction of another kind.