Social protective factors include quality school relationships, close relationships with non-deviant peers, involvement in prosocial activities, and exposure to school climates that are: well supervised, use clear behavior rules and disciplinary approaches, and engage parents with teachers.With many conceptual factors that occur at varying levels in the lives of those impacted, the exact causes of violence are complex. To represent this complexity, the ecological, or social ecological model is often used. The following four-level version of the ecological model is often used in the study of violence:
The first level identifies biological and personal factors that influence how individuals behave and increase their likelihood of becoming a victim or perpetrator of violence: demographic characteristics (age, education, income), genetics, brain lesions, personality disorders, substance abuse, and a history of experiencing, witnessing, or engaging in violent behaviour.The second level focuses on close relationships, such as those with family and friends. In youth violence, for example, having friends who engage in or encourage violence can increase a young persons risk of being a victim or perpetrator of violence. For intimate partner violence, a consistent marker at this level of the model is marital conflict or discord in the relationship. In elder abuse, important factors are stress due to the nature of the past relationship between the abused person and the care giver. The third level explores the community context—i.e., schools, workplaces, and neighbourhoods. Risk at this level may be affected by factors such as the existence of a local drug trade, the absence of social networks, and concentrated poverty.
He writes that "Buss and Shackelford (1997a) proposed seven adaptive problems our ancestors recurrently faced that might have been solved by aggression: co-opting the resources of others, defending against attack, inflicting costs on same-sex rivals, negotiating status and hierarchies, deterring rivals from future aggression, deterring mate from infidelity, and reducing resources expended on genetically unrelated children. "Goetz writes that most homicides seem to start from relatively trivial disputes between unrelated men who then escalate to violence and death. He argues that such conflicts occur when there is a status dispute between men of relatively similar status. If there is a great initial status difference, then the lower status individual usually offers no challenge and if challenged the higher status individual usually ignores the lower status individual. At the same an environment of great inequalities between people may cause those at the bottom to use more violence in attempts to gain status. Media
Research into the media and violence examines whether links between consuming media violence and subsequent aggressive and violent behaviour exists. Although some scholars had claimed media violence may increase aggression, this view is coming increasingly in doubt both in the scholarly community and was rejected by the US Supreme Court in the Brown v EMA case, as well as in a review of video game violence by the Australian Government (2010) which concluded evidence for harmful effects were inconclusive at best and the rhetoric of some scholars was not matched by good data.