I think the nature vs nurture debate should be laid to rest and we simply accept that both are influential in human development. Although we each receive a genetic influence of chromosomes, environment plays an equally important role in our development. The argument of which is greater may never be substantiated.
“Bad” outcomes defined by Jean-Jaque Rosseau as being such things as aggressive behavior learned from others or from experience is offset by more modern studies into behaviors intended to injure other persons or objects. This definition of aggression has shown to occur in every child to at least some extent. The form and frequency of aggression, however, changes. In Chapter 11, I found it interesting that studies show how aggression changes with age. Young 2-3 year old children use aggression to achieve a goal, like getting their toy away from another child, and is defined as instrumental aggression. This aggression stops as the goal is achieved.
Hostile aggression is found in older preschoolers, whose goal is to hurt other’s feelings. Physical aggression hurts others through physical damage or threat of such damage. Trait aggression is predictive of a long-term pattern of antisocial behavior.
Relational aggression is found at all ages, even as adults, as ostracism, threats of ostracism, and cruel gossiping or facial expressions of disdain are frequently used in all levels of society.