gryphon said, "I disagree that the shooter would be responsible for the death of the intruder"
If you shoot and kill someone, you are responsible for their death (i.e. you caused it), even if the other person caused the confrontation and even if the shooting was legally justified. I think that's what CMichael meant.
Certainly, be ready to use deadly force, but don't be too quick on the trigger, and especially don't fire a shotgun through your front door.
We all seem to agree, just wanted to clarify.