actually no, the only time other than on this forum that I seriously think about "what if someone came into my home" is when my german shepherd barks his warning barks. when that happens it is usually because the cat made some sort of noise elsewhere in the house, a motorcycle or especially/abnormally loud car or truck just went past, or because some kids are playing in a nearby yard. so when he barks during the day I assume a friend or family member may be approaching the door (again, mother in law is far scarier than godzilla on meth) I look through the door or window depending on which room I am in, if someone is there I tell him good boy and make him lie down while I open the door, if not I tell him that its okay. all the while unarmed.
during the night if he barks I turn on the light and turn on the hall light, then proceed to check each room (unarmed, except for the dog) and turn on outside lights to peak out the windows. if I dont see anyone (always the case so far) I turn out the lights as I head back to the bedroom and assume that it was one of 2 things. #1: who knows what, but harmless and glad the dog heard it and had me check it out. or #2: possibly a potential burglar who was checking houses (or just mine) to see if anyone was home and/or if there was a dog in the house; he/she heard the dog bark and then lights came on so they probably wont be back.
The only time I carry my gun at home is when I am cleaning it, unloaded; or when I am carrying it to the car to go to the range. the only time I would ever shoot someone is if I was sure they meant me or my wife (or future children) harm. how owuld I know that? because the feirce barking of a very highly trained german shepherd did not daunt them, because my warning that I was armed and have already called the police did not daunt them, and because my locked BEDROOM (forget about locked exterior door) did not stop them. would I be upset if someone came into my home and stole my belongings? yeah, who wouldnt? if I know someone is in my house will I leave my bedroom or even leave the door open? no, unless another comes through the bedroom window and forces me out. if after warnings of a gun, warnings from the barking dog, warning that the police have already been called, and a locked bedroom door doesnt stop them I think (wont know until it happens and I pray it never does) that I will shoot. after all those warnings I will still look for a weapon in their hand/hands before I fire, possible its a deaf kid who didnt hear any of my warnings, if they have a weapon I will have to assume they mean my family serious harm and I will shoot and I will hope that the first shot drops them or atleast does enough damage that the pain and shock allows for a second shot IF necassary. Im not saying I would shoot, they fall down but are still alive and I would shoot again. I would only fire twice if the 1st shot failed to stop them (wether stop means kill or just stop). if I shoot and they live and are bleeding all over the place and in pain but no longer a threat I dont know what I would do, besides hope that the authorities are almost here and bringing an ambulance.
in my opinion, in that situation the bad guy has been given ample warning and did not heed it only because his intent was to hurt or kill me or my wife. my intent will be to stop that from happening with as much force as needed.