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Our perception of morals is a result of our shared evolutionary history. In the absence of external forces (violence against us, economic pressures, environmental pressures, etc.) no person could claim that forcing violence on another is a moral thing to do. Neither could they claim that the morality of violence is subjective, as the outcome of their violence has far reaching detrimental effects beyond their self. To put it in evolutionary terms: killing of a fellow human, without influence from external forces, would be a negative for the species. It would limit reproduction, lower genetic diversity, and have many other negative effects. As such, we can conclude that violence is an amoral absolute. It would then follow that freedom from violence is a universal right (that is sadly infringed upon far too often).