Bandura’s Social Learning Theory suggests that acts of aggression are learnt through the observation of role models. His original “Bobo Doll” study showed that when exposed to aggressive behaviour small children copied this behaviour, not just by being physically aggressive but even copying the verbally aggressive behaviour. However this study focuses on children who are supposed to learn in this manner, this doesn’t demonstrate that this would also be true in older children or adults who already have a set moral compass that would interfere with copying aggressive behaviours. However Bandura’s later study showed that if children saw someone get punished for aggressive behaviour they were less likely to be aggressive themselves when they were allowed to play with the bobo doll but if they saw someone get rewarded for this aggressive behaviour then they were much more likely to act aggressively themselves, this shows that vicarious reinforcement is important to the learning of aggression through the social learning theory, as receiving direct positive reinforcement leads to people having high self efficacy making them very likely to repeat the aggressive behaviour that they were rewarded for. In terms of aggression this reward could come in many forms such as acceptance from a violent gang they want to be a part of or just attention from a parent or teacher. Moreover, Walter and Thomas' study in 1963 further supported this theory as the results of the study demonstrated that aggressive behaviour was a result of imitation of role models. However, the social learning theory does not explain what triggers aggression. Additionally, the study emphasises nurture and learning through observation - ignoring nature and biological explanations.
On the other hand, Zimbardo’s theory of Deindividuation suggests that aggressive behaviour occurs in groups as a person’s normal constraints become weakened