That's the problem. A lot of these folks have half a brain, and lack the skills and reasoning ability to handle a true emergency. I have a CCW, but only use it when I go hiking/fishing or in very sketchy areas. I would only shoot someone/something as an absolute last resort.
My point is that a lot of gun people I know, who are really into it, want the chance to use it someday. When you carry everywhere and don't have law enforcement type training, you're asking for a problem. Just ask George Zimmerman, and please review his post-Martin record as evidence.