These idiots need to be taught a lesson, as they endangered the family in the car as well as themselves.
With the number of realistic paintball guns out there today you should not go waving them around in public, as that is looking for trouble
I personally own a US Army Project Salvo
http://www.usarmypaintball.com/ - It is configured for playing paintball and home defense
What if the driver of the car had taken evasive action when he heard the shots and impacts, he could have had or caused an accident.
As for the kids in the car they risked been shot at by police especially since it sounds like they tried to evade arrest.
As for Albreths statement, what do you do if you see a person holding what appears to be a firearm aiming at another person, as a police officer you should shout a warning to drop the gun, but if that gun turns in your direction then you can shoot if you feel your life is in imminent danger
As for the kids, from what I read they can be charged with
Pointing of a firearm
Malicious damage to property
Reckless and negligent driving
As for the mother, her reaction is actually quite common when they know their child was in the wrong