Since we're playing Youtube with anecdotal evidence, here's the story about an Ohio cop killed on a "routine traffic stop" by a CPL holder. Maybe the officer was complacent because he assumed the guy must be a "good guy" if he had a permit. Maybe he wasn't and it was just another case of stuff happens. The fact that you have a CPL means only one thing to me: You're allowed to carry in a state and in a manner that you otherwise would not be legally allowed to in the absense of a permit. It doesn't mean you're a good guy, it doesn't mean you're proficient with a gun, it doesn't mean you're not a criminal, it doesn't mean that you're smart enough to not expose your gun in a threatening manner, it doesn't mean you get any brownie points on a traffic stop.....It only means you can carry in a situation where someone without a permit can't. That's it. And the shall-issue laws where they exist were made with all of this in mind for the protection of the citizen-carrier, not the cops.

Ohio Man Shoots Cop in Traffic Stop, Gets Death Penality Pt 2 - YouTube