These lessons then are translated into another type of animal...human animals. Arbitrary factors are used to decide who is so called good and who is so called bad. They are used instead of actually deeply examining who a person is.
Kids don't hate each other or other humans or other non human animals. They don't desire to kill them. If you don't believe me watch little pre-verbal infants and toddlers playing together or with an animal. They only see friends. It is us the adults who make them see enemies.