ONLY if my own life were threatened could I pull the trigger. And I would.
We have guns in the house. They older and for sentimental value, not intended for self protection. I know where they are, but I doubt I could get one "in time" to address an intruder.
I do not keep a gun available for protection because a) it would more likely be turned on me, and b) I don't want to be responsible in any way for the death of another person, even though I could and would use it. c) I don't feel I live in an area that would require such action from me.
Most intruders do not want to kill, and do not intend to. Most are not even armed.
Our "better weapon" is that we have telephones througout the house, and the police are close enough. Heck, we don't even lock our front door! Day or night!