Carry,
There ain't a good, pure one (victim) in this tale.
It ain't the shooter, though he was the initial victim of an unjustified egging by kids who were as likely to have gone on to further attacks (less minor league) on others as they were to straighten up and fly right. (especially given their apparent lack of good parenting)
But, for the same reason, it ain't the kids either. They weren't shot for just doing nothing or even "harmless pranking". They were throwing hard things at moving vehicles, and apparently before hitting this guy hit a lady in the face while she was driving. That's not harmless, that's dangerous (crash waiting to happen) and ignores the unjustified property damage (paint and potentially glass) to other peoples hard-earned property. Under the law, just hitting that lady constituted simple assault and could have been resisted with equivilent or slightly higher force.
The point is, by restraining (by law) the injured party in such situations from immediately administering a justified butt-kicking, we have removed a level of deterrence that previously existed. Additionally, by society accepting parents saying nonsense like "they were good kids making mistakes" instead of treating them like the proto-criminals they are (and insisting such parents apply some correction woodshed style) the kids get the "I'm untouchable" mentality and never learn there are consequences for stupid, anti-social choices.
That is until Mr. Felon or someone like him comes along and takes them to the worst-case school of hard-knocks reality.