Another possibility is the control theory of deviance proposed by Hirschi http://www.criminology.fsu.edu/crimtheory/hirschi.htm does a better job. In essence this theory attributes violence (and delinquency in general) to the breakdown of social relations in a particular social setting e.g. housing projects.
Wojtek
^^^^^^^ CB: Sounds like Hirschi has got a key component. Social relations "breakdown" in correlation with economic "breakdown".