In 2010, there was a homicide. It was ruled self-defense, but I believe you yourself have said even in self-defense it is murder. So no, it wasn't 0 for 2010. I'm sure I'll be able to shoot more holes in your points when I have more free time.
http://usnews.nbcnews.com/_news/2013/04/01/17547970-hundreds-of-teens-mob-pedestrians-on-chicagos-magnificent-mile?lite Seriously, those kids need pistol whipped, not charged with misdemeanors and released.