You are exactly right. Once they’ve invaded your home, they have lost the right to this life, because there is no other way to remove the threats they pose.
Not sure if i go that far, all i mean is how does the guy know they aren’t running away to regroup and come back at him? I just think that is a stupid automatic assumption that they arent going to come back again once they get safe, and try some pincer type movement or one sneaks around from behind. It has happened to plenty of people. They could have a vehicle with others in it for reinforcements.