An upbringing to violence?

Why do some boys develop into troublesome youth who eventually get sentenced for a violent crime? In planning a strategy to fight violent crime it would be useful to know if altering the conditions of children''s upbringing and the ways we treat children generally could contribute to a reduction in the incidence of ciolent behaviour that leads to convictions among adolescents and young men. In this study information from population-based registers covers various aspects both for children, aged between 15 and 27 years, and their parents: health (mental and physical), education, social networks, family violence, self-destructive behaviour, parental alcohol or drug abuse, and unemployment.