There's no argument to be made here. The streets were a complete melee, both sides are guilty of violence and an idiot ended up getting killed. Pointing fingers at one side only promises to increase the violence.
You and your comrades continue to argue it was bad that someone brought a gun to a knife fight. I'm arguing "Well you're all dumbfucks for getting involved in a street fight". It's not shocking someone got killed in a street fight, I really don't care what form of weapon was used.