News flash, he didn't kill anybody. He shoot a thief, I say more power to him. We need more people like him IMO. Isn't one of the points of owning a gun so you can protect your property??
Does that mean we can use our guns to march into the CEO's office of our stocks and shoot them if it loses money?
Look, there is an uncomfortable gray area here. Guy sees two big guys stealing his stuff. He wants to stop them. He should call the police, but there's a window before they get there. He wants to stop them stealing his stuff, and he's a great risk if he doesn't take his gun so he does, and tells them 'stop where you are and wait for the police'.
Now the easy part is if the criminals rush at him in response - that's a self-defense shooting. But what if the criminals say they aren't going to hurt him, but they are going to take the stuff and keep packing it up? The guy's only choice then is basically let them take it, or shoot them.
Now, as a moral society, Texas excluded, we have largely decided the value of life, including a thief's life, is more than the value of the property, and we don't let the criminal get killed for the property. Some don't agree with this, but I think they're wrong. But it sure raises an awkward situation for the gun holding property owner standing there not using his gun to keep his stuff.
Making it worse perhaps is that not only is that the law, but people are not socialized to understand much less agree with it - politicians hardly want to be the messenger that gets killed for spreading the unpopular message of how that works, so the instances when it happens are likely to have bad things happen, as they did here.
There are more gray areas, since the property owner could have his friends tackle and forcefully detain the thieves - what weapons can be used? When does the physical struggle move from detaining and not killing, to self defense allowing for the use of deadly force? There are no easy answers IMO - including the one some think is one of 'let the property owner shoot to kill period'. If he gets in his car chasing the thieves and shoots them out the window, fine.