Early Societies Were Violent, Superstitious and Unfair
(p. 89) Human nature is malleable. We use our minds to change our values, expectations, and definition of ourselves. We have changed our nature since our hominin days, and once changed, we will continue to change ourselves even more. Our inventions, such as language, writing, law, and science, have ignited a level of progress that is so fundamental and embedded in the present that we now naively expect to see similar good things in the past as well. But much of what we consider "civil" or even "humane" was absent long ago. Early societies were not peaceful but rife with warfare. One of the most common causes of adult death in tribal societies was to be declared a witch or evil spirit. No rational evidence was needed for these superstitious accusations. Lethal atrocities for infractions within a clan were the norm; fairness, as we might think of it, did not extend outside the immediate tribe. Rampant inequality among genders and physical advantage for the strong guided a type of justice few modern people would want applied to them.
Kelly, Kevin. What Technology Wants. New York: Viking Adult, 2010.