No they don't. Chances are the guy didn't just charge at him from a distance with the knife out, so its not like he would have had ample time to react to grab the gun, and having the gun poses as much a risk to himself than it does the attacker.
Eh, I still don't think I'd go around strapped after this experience. As for the mugger, he was a whitey who was drunk. I have actually seen him before as he hangs around the strip mall where my bank atm is located. It's been a while, but my basic training experience flooded into my mind as I was dealing with the situation. Go for the arm holding the weapon, try and break the grip, used my other arm to elbow him in the face, etc. It all happened in a flash.
And, while not legally considered one, become a murderer.
Yeah, that's not exactly the most compelling defense of gun rights.
Killing someone is often done before you think about the ramifications of your actions. I have gone through the process before and I don't think I'd ever want to go through it again. I'm not mentally wired to do it like some of the other people I served with were/are.
I have a difficult time even being around guns these days, much less wielding one.