If someone enters my house armed, unarmed, facing me or not I don't no his intensions. Its my home not his, whether he's stealing my dog food or using my toilet, I will not shoot him, I will kill him. Dead men tell no lies.
Probably not the best plan. Are you really going to shoot the five year old neighbor kid who comes into your home? How about the woman from across the street who runs to your house for help because a burglar was in her home? How about the passerby who sees that your house is on fire and runs in to see if anyone needs help?
Shooting someone has to be something that you consciously choose to do, not an arbitrary rule. There are limitless scenarious. Some where you should shoot, some where you should not shoot. Be smart about it.
I truly hope that you are exagerating and that you would not kill an unarmed child who came into your house to use the toilet.