Recommend listening to this brutally honest and excellent interview with an individual that got caught up in the cycle of hate and murdered when he was 17. Talks about the murder, the young child that witnessed it, his maturation, reflection and even his anger towards prison guards for laughing and mocking the death of what would have been considered his enemy at the time.
Fella is now involved in conflict resolution.
http://news.bbc.co.uk/2/hi/uk_news/7961035.stm