I saw this and immediately thought that the shooter was probably a gang banger. I don't think a law-abiding, weapon packing citizen would have done this.
I agree with F5 on this one - the shooter needs to be strung up as appropriate.
As for the surviving kids, they should be sentenced to a year of body shop and detailing work. As a long time scholar and practitioner of criminal justice and sociology, I have found that in many instances, perpetrators often would not have initiated a criminal had they had a measure of respect for the victim or property.
If they don't get the point after that, barring a crime of violence, then the punichment dial should be turned to "fry".
