Let me ask you gun owners in fear of home invasion another question- why do you honestly think an armed assailant would want anything but your valuables? Why do you think you can one up them at their own game and shoot them first without endangering yourself or your family? SUrely if a criminal sees you have a gun they will take appropriate actions and take you out just for the fact that you have escalated the threat level on their lives. A home break-in, in most cases, only results in property lose until a criminal feels threatened.
What are you gong to do?? Turn a corner like Jack Bauer and blow their heads off before they see you?
Doesn't work like that, especially without the proper training. In fact if you take a self defense course most instructors advise you to run and never try to fight or disarm an attacker because usually it is extremely dangerous and very difficult.