Kids that age are too curious, and the shooter should have just told the girl to go home or tell the father to take the girl home. For some reason shooting and killing kids for any reason seems to become the actions of adults these days. Of course killing babies being legal just gets extended to kids. Adults in todays culture don't think kids are supposed to be active and do go where they aren't suppose to. Danger and rights of others don't get learned by kids until older. This adult would have killed sooner or later and it's too bad the law system didn't move to put some control on him by using the law. He had a history of explosive problems. The Father probably moved to get his kid and received the killer's explosive anger.