I found an article about that http://www.ucl.ac.uk/news/news-articles/1112/111205-maltreated-children-fMRI-study

It explains a lot

Also, most experts believe that children who are raised in abusive homes learn that violence is an effective way to resolve conflicts and problems. They may replicate the violence they witnessed as children in their teen and adult relationships and parenting experiences.

Children from violent homes have higher risks of alcohol/drug abuse, post traumatic stress disorder, and juvenile delinquency. Witnessing domestic violence is the single best predictor of juvenile delinquency and adult criminality. It is also the number one reason children run away. (Source)