*sigh*
I wonder how many of the people who are sitting here going "Yeah, if he were unarmed, just do some kung-fu special move on him, and be all cool and shit!" really have ANY idea what it is like to be the victim of a burglary.
You are in your house, it is dark, you just woke up, you don't know if you actually heard something, or if it was your imagination. Then you hear it again, a chill runs up your spine. Your HOME, your private sanctuary, has been broken into. You get up, and don't have any idea what is down there, if it is just ONE person, or several, if they are honorable people that got pushed aside by society and is forced to steal to be able to pay for their ailing grandmother's medicine, or if they are drugged up, hardened, psycho repeat offenders here to take whatever they can get in order to get their next fix. PROBABLY the latter. Also, imagine that you are married and have kid(s) sleeping in the next room.
Now, you are saying that in the dark of night, where you are alone versus gods know who and how many, you are perfectly composed, and able to discern not only if the intruder is a threat, but also take said person(s) down with minimal required amount of subdual force, knowing full well that you are the only line of defense your family sleeping in the next room?
No. You would be scared out of your mind and fighting for your life if the burglar didn't split the second he heard something.
This is not a debate over whether or not it is right to kill. This is a question of saving ones own skin in a severely compromised situation. Of course, if you win the scuffle, and the burglar is knocked out, outright killing him is wrong, but I don't think that is what this is all about.