Baloney! If anything, the officer who pulls you over will know they're safer because the license plate # tells them the car belongs to someone with a CHL and that person has a "clean" record or couldn't get a license to carry in the first place.
The few times I've been pulled over, I hand them my CHL card along with my driver's license and car insurance cards. They're always curious to know what make I'm carrying (K&H 40 Compact).
Then they write me a warning ticket and I'm on my way.
People need to realize that the police usually arrive after the commission of a crime and rarely prevent a crime. Your personal safety if up to you.