Well, I use to have a shotgun bird-shot first round then buck shot shells after always ready to go in the bedroom. Sounds like this all could of been avoided if they had a peep hole or he looked out the window first.
I guess I am semi paranoid. Then I started to worry if someone broke in my house they would most likely take the shot gun and it would be used by the bad guys. So Now, I lock it up in a gun safe. I have out door infer red (pet immune) motion detectors placed at the driveway, behind the house and aimed at my 40' deck and my car parked right in front of it. They will chime starting at 6PM till 8AM to let me know someone is outside. I have the place lit up with two 40 watt florescent bulbs to see who is wondering around outside or cumming up the deck to knock on the door. Anyone I don't recognize or looks suspicious (you know after 10PM don't know em and wearing all black)... I go get the shotgun.... Not like I live in the BEST of neighborhoods but. I think I got it pretty well covered. I only lock the safe when I'm not in my home.
I've never gone to the door with a gun, tho I have come out side once late at night with a can of mace... The guy claimed wrong house after honking in my driveway at 1AM, I think he was drunk. Sigh... Other then that never had a problem but you'd think being a marine the guy would have taken some precaution when answering a door. Sad story and all the better to be safe then sorry. Tho, if you gonna get a fire arm at least get a safe and lock it up when not home.