http://jcr.sagepub.com/content/38/4/620.abstract
http://pubpages.unh.edu/~mas2/ID52%20Draft%20M2.-with-tablespdf.pdf

Boys in their late childhood who have been socialized with aggression have the highest chance in engaging in homicides or assaults. Studies have found that aggression is more of a consequence than a result from the war or children observing violence at home. Delinquent and or teenage children, and within this contect there are two forms of approved violence which consist of within-family violence and non-family violence. There are gender differences and national context difference that heighten or lower the standards for violence.

By gender, males are expected to be much more violent than girl, thus the phrase "boys will be boys". Disciplinary methods taken onto boys are much more physical than one would with girls. They were expected to take on more aggressive acts in society or an aggressive behavior or nature in general.35

Every society has different methods in which to raise their child, the attitude and beliefs they have towards it influences the behavior of the child but as they develop more towards a specified goal they believe less in violence. Which is to say the amount of violence tolerated deteriorates. An example is that we don't settle interpersonal fights with duels, but rather with a higher chance of both actually suriving. This lessens the chance of children being influences by violence or their childrearing being violent.

Violence is not as expected in more developed countries than in less developed. However, there are links according to the type of violence and its link, as there is family-violence, linked to socio-economic development since its within the confimes of a home. Then there is the combination of male and sexual violence that is linked to socioeconomic development along with the growing roles of women.