I think I heard him reloading a gun a few minutes after he shot the boy. There was no reason for him to shoot those kids - he would have scared the shit out of them just by being there with a gun. He could have held them while he called the police.
If someone was stupid enough to break in here I couldn't shoot because my dog would be biting the shit out of them. My guns are purely for self defense, and I would only shoot an intruder if they hurt Jett or were getting close to me with a weapon. This guy should have just got an alarm system, but he wanted to catch and kill someone. It was downright murder, and I'm glad he got convicted.