I think you are deeply misjudging the complexity of the human experience and being particularly blind to or biased against our collective history. If you spend any amount of time talking to people or even just reading the personal writings left to us by the ages you quickly realize that everyone who has ever lived is no different from yourself, we simply made different choices based on the information available to us, for good or evil. Anyone, given the right conditions, is capable of being a monster or a saint.