Personally if the two people who where potentially armed males, where in the process of stealing my car, I would let them. ITS A CAR. IT CAN BE REPLACED. WE HAVE INSURANCE.
I don't know the full story... but from what has been said in the news article it seems they (the two thief's) where there to steal the car and not enter the home (speculation and not fact). Therefore I don't see the point in risking the safety of your family in a poteinal crossfire just to protect a materialistic object that CAN BE REPLACED... LIVES NOT. Now if they where to enter the house and pose a threat to family and/or friends, different story. IMO
I know this will piss people off, but really ask yourself at the end of the day, would it be worth it. I wouldn't be able to sleep for a long time knowing I took another person life albeit a robber/thief/crook. It would taunt be forever. Not to mention the what if's that could of occurred.

eep: