A child can pull a trigger just as easily as any adult. Ask any Vietnam or Afghanistan vet.
Not saying the shooting was righteous, but it's dark, play guns look real in the dark and a sudden rush of cars into the neighborhood would make me nervous, too.
Years ago, a bunch of kids were on my place without permission, engaging in a paintgun war. I scared the crap out of one of them, as I was trying to figure out what was going on...Staring into the business end of a shotgun can give a young man a religious experience.
This type of behavior with nerf guns should have been nipped in the bud previously.
You don't shoot at people running away.
Culture. Culture. Culture