All I can say is that many officers have been shot by a person that was issued a CCW. Having a permit only means you qualified to get one and not that you will maintain the same character you had at the time of the application. One man I casually knew got his permit and within a year got two DUI and shortly afterward shot his wife in the back. It could have just as easily been an officer he shot.
Go to this link.
http://www.vpc.org/fact_sht/ccwlawenforcement.pdf Each of these people were law abiding citizens..........at one time.