BULLYING LINKED TO HOME VIOLENCE

Here's a theory put forth by a study done in Massachusetts, USA which really makes sense when one thinks about it.  Behavior is learned for one thing, and many times serious 'acting out' behaviours are a reflection of something going on in the child or adolescent's life.  For some stats follow the link. 
http://www.medicalnewstoday.com/articles/223219.php

ACADEMIC JOURNAL

 Pediatrics / Children's Health
Article Date: 24 Apr 2011

Bullying At School Linked To Violence At Home

Bullies and those being bullied are more likely to be experiencing family

violence at home, a new report issued by the CDC (Centers for

Disease Control and Prevention) and prepared together with the

Massachusetts Department of Public Health has found. The researchers

found that among middle and high school pupils across the state,

encounters of family violence were more common among young people

who had both taken part in bullying and been victims of it.

The CDC's Morbidity and Mortality Weekly Report (MMWR) report explains that a growing body of evidence has been linking family violence with bullying. The authors write that they gathered and analyzed data from the Massachusetts Youth Health Survey (2009), an anonymous, paper and pencil survey carried out every 24 months.

There are considerable differences in risk factors contributing to individuals involved in varying categories of bullying, compared to those

who have never been active bullies or victims of it.