"Democrat St. Joseph County Prosecutor Ken Cotter said if people were not required to have a license to carry a handgun then police would lose a way to quickly obtain information about a person discovered with a concealed weapon during an encounter."Nice try Ken but unless a person is breaking the law, the simple fact that a person has a concealed weapon in their possession is not a reason to "quickly obtain information" about them. A law abiding person, carrying concealed, is not likely to resist your attempts to discern what has happened in some situation.
Usually, these kinds of fears aren’t statistically supportable, as you’ve alluded to. And few people bent on evildoing are going to bother getting one of these permits anyhow.