If someone broke into my home and there was any way to avoid taking life then I would, warning shot to scare them off, using non lethal force first etc. As always, the situation will dictate the action you take. Was the person armed or unarmed?? Was it a kid or a 300 pound brute monster intent on assaulting your wife?? Where I live, this sort of situation is worth preparing for as much as any other. I feel that if anyone disagrees then they simply need to NOT break in to my home and threaten my family.
Well what usually strikes me, with these guns topics is the fact that people don't see other effective measures being out there. Preventive action is way better than repressive action. Shooting a intruder is effective to defend your self, but not having intruders in your house is a lot better. Shooting also is a repressive action, which requires someone to be there. So shooting should be the last thing ditch measure. (some may agree or disagree about this measure, but that's stuff for heated debates)
So mine first question is very simple, have you though of the preventive measure (target hardening) first? Prevention is usually more effective and is generally considered a better place to start.