I really feel sorry for the Officer; he had no choice but to do his duty and defend himself, and I'm sure he'll carry the guilt around for the rest of his life.
But the bottom line is, don't threaten or attack a Police Officer. Period.
As will the father for calling the cops in the first place. Tragic story all around and during the holiday season as well.
I went to highschool with a kid who lost his only sibling, a brother, in a skiing accident. About two years later he was killed by police after walking around the neighborhood with a loaded Uzi during a drug/alcohol induced bender. In a matter of less than three years his parents had lost both of their children.