It would be interesting to hear the rank and file police officers chime in on the subject of unlicensed carry. My guess is that just like campus carry and open carry, CC passing would not change at all what they do daily.
The implied expectation for putting up the barrier of training for non-licensed carry is that the people who might take advantage of will shoot themselves and potentially others, posing a menace to society. But lets consider that criminals already carry without training. I'm sure that some of them practice but I doubt seriously that they go around taking classes in firearm use and safety. We have all seen the videos of some of the really stupid ones like the guy at hotel counter during a stick up with his finger on the trigger while he was counting the money and off-ed himself. But those see few compared to the number of criminals who use guns effectively against trained police officers. That poses a logical question: who do we think is smarter - criminals or people who want to defend themselves? If untrained criminals can effectively use guns, what is different about ordinary, law-abiding citizens.
The next question is why hasn't unlicensed carry in cars (which as been the law since 2007) have caused more problems. It is a given that maybe not a lot of people know about it and do it. On the other hand, why would it be different than Constitutional Carry? You have to be interested in the goings on in politics to even know what Constitutional Carry even means, in spite of the periodic evening news blitzes about it. I would suspect that a fair number of people have a healthy respect for the fact that you just cannot take a gun anywhere and there are more than a few LTC holders that I've talked to who are really uncomfortable about that, in spite of their class time. Unless you study it after the class, 90% of that material leaves your mind within 6 months.
Finally for me, there is no better example of government mandated training that driving. We all took the classes and the written exam. For some of us, that was a half a century ago. The car is a lethal weapon and we turn millions of people lose with it every day, some of whom probably shouldn't be riding even a bicycle on the public streets. They had the training. And it isn't like we don't have at least 18 clear examples already of States with fair sized populations who have had CC for years and the gun grabbers have been unable to find enough stories because of it to bring onto the evening news. You just know if they could make the case by example (think George Floyd) of what they don't like, they'd be doing it.
Am I in favor of firearms training? Absolutely. I think there out to be PSAs on the media about getting trained. But making it a barrier to carry a gun in public isn't much different than the poll tax to me. I submit that cops should be well trained and they have NDs,, too.