Deliberately aiming or not has nothing to do with it either. If he set up a situation to entice a thief, then swept the room with a shotgun when one showed up, that’s not self-defense.
Only the government can “entice a thief” (so-called) and not the citizen, I see. In order to be enticed, one has to be a thief in the first place. And there was no enticement besides—an open garage door is not such.