Honestly, the LAST thing I'd want to do is to kill someone... well... not the *last*... that would be for anyone in my family, myself included, to come to harm. All the same, if I can show ol' Roscoe to the intruders, and they run away never to come back, I'd be a happy camper. Not all that unlikely, either, as it's been studied, and the number of successful firearms defenses are anywhere between 800,000 (antigun bureaucrat number) all the way to 2.5 million (Gary Kleck, whose only crime against his liberal employers was that honest research changed his mind), a vast majority of them never involved a shot being fired (and a few, either missed or warning shots).
Heck. Since criminals are such cowards, just having something that resembles a gun will statistically have 'em running for the hills.
I wouldn't advise that, though... if a baddie were desperate enough, or otherwise emboldened, you want something to send his way.