The Social Psychologist defines aggression based on intents. They see aggression as a behavior that is intended to harm another individual who does not intend to be harmed.
According to social psychologists, Violence is a subset of aggression. It is an aggression that has extreme physical harm as its intent. Aggression does not have to be physical, it can be a verbal or social aggression intended to shatter someone's physical relationships. Social psychologists consider aggression to be basically about self-concern. They see violence as a response to "threat to self". Aggression is a product of the nature of a man and the social situation he surrounds himself with. Aggression varies with personalities, but it can either be reduced or escalated through the influence of our social circles.
The sociologist or personality psychologist believes that it is not the individual that perpetuate violence that is solely errant but the society that produces him is responsible for the violent behavior. This is justified by the reason why some communities and nations are more violent and aggressive than others.