The essay is about causes of anger, aggression and violence in human beings.

Aggression in Humans There are many different reason why a person may act aggressively towards other human being. The person may act this way because of his background or the way he/she was brought up in life. A person does not; act this way based on natural feeling alone. Is more like a melded, learned behavior. A human being must have both environmental and instinctual factors in order to show aggression. Some of a …

…in a person's surrounding environment. It the combination of environment, society and culture that creates aggressive behavior. It is the person's instincts that are the basis for the three. While one tribe is a peaceful group of people, and the other a group of aggressive warriors. Both of the tribes had the ability for aggression and peaceful life but it was their environment, society and culture that have driven them to choose totally opposite paths.