Who was it on here was defending drunk

Sometimes I just don't understand the justice system. A co-worker's son was killed by a jerk who had 4 DUI's to his credit, and was allowed to walk by the judge. How can that happen? A few months later, another co-worker saw the murderer in a bar and gave him several good ones in the ribs and then a really good one in the nuts with steel-toes. I'm not in favor of vigilanty justice, but in this case it was merited.