Kids aren't just kids being kids anymore.
They are mean, destroy things, hurt people, and animals. They have no respect anymore for anything. I refuse to let my children grow up like that.

By him going out, threatening them, letting his dog outside to scare them, and getting physical with a child (thats right a child and I don't care who swung first, its still a child)
he taught them that is ok to act that way. Great lesson to be learned

Kids need proper discipline, find out who their parents are, call the school, call the police, but never ever threaten a child. Walk away, property can always be fixed.