If I shot someone a block from my house who was running away from me, I wouldn't be able to live with myself, depending on the specifics. I will shoot to protect from threat to life or serious bodily injury. If you broke into my house, and still inside, I'm going to reasonably assume you are there to do your worst to me or my family. If you're running away from me with my laptop, you're welcome. Have a nice day. If you're running away from me with one of my guns, you're at the mercy of whether I think you're about to use it against someone or not. If you're running away from me with one of my kids, you're having a near death experience, as in you're about to have a full death experience.