Tribalism plays a large part. Each new human has to be civilized and taught respect for other people, other people's property, and morals. When that is not done, young men tend to revert to the default position, which tends to be a low grade of tribalism or a childish attitude of rights without responsibility.
Christians might refer to this as original sin, which amounts to the same thing as the lower level instincts that evolutionists would refer to.