Having dealt with violent behavior in my own family, I am convinced that both heredity and example are factors....But to really help, you can't waste any time blaming yourself. Ultimately, we all have to be responsible for our behaviour (whatever the original cause). Continue to love him and most importantly ..encourage him to seek professional help. Once he has acknowledged that he needs it....I truly believe that it will be a positive road. In my family, sometimes the episodes of violence were not even remembered. I'm assuming that our own minds are very capable of "blocking" out that of which we are least proud. good luck.....grace