Their justice was not punitive, it was restorative. A man who killed another man would likely be made to take on the responsibilities of the person he killed and support that man's family. They had no prisons or poverty.  They had no alcohol, and unlike the Europeans who were strongly affected by alcoholism among their people, their cultures developed without it. They had no wealth. There were over 200 plants used in the western hemisphere for women's health, birth control, and population control. They were deeply spiritual and honest. They were a race of mystics and vision seekers, and they built their ideology around the character development of the individual human being. They weren't trying to make the world "better." They focused on making oneself better. Their predominant values of responsibility and respect were pretty universal.   Lewis and Clark went across the entire continent and back without a single death from aggressive tribes.