Wow. As someone who hates guns and has often found fault with "stand your ground" nonsense, I can't believe anyone could argue that it's in any way wrong to shoot 3 people who have invaded your home. Unless they break in while you're right next to a door that is 15 feet or less away from a police station, getting your gun and taking your shot(s) is a very reasonable course of action.
In America. Elsewhere, the notion of having a gun in the first place is disturbing.