"For some strange reason he seems to think that I am a decent shot."
From what I've seen, females are much easier to teach shooting then males. They'll admit they don't know what they're doing and listen. Guys grow up watching shootem up movies and already know how to shoot, complete with bad habits and some ridiculous techniques. (Personally, I hope all the little gangstas learn to shoot from DMX and Vin Diesel. That silly sideways grip just gives me a better chance.)
I've had a CCW for years and would have no qualms if it came to a choice of me (or family and friends) and them. Remember, they're the ones that put YOU in that situation.
And finally, this is something that's already been alluded to: criminals rarely have just one victim. The victims can be numerous and spread out over years. A former girlfriend was badly raped in a parking garage. The night she told me about it she cried, not for herself but because he was still out there and some other girl would have to go through what she had to. Some people give up their rights to live by their actions, some people just need shooting.