Anyone can buy a law book. If they read it a lot, they may learn something about the laws. Doesn't make them a lawyer.
Proper training with a firearm makes one proficient with the firearm. It doesn't automatically confer knowledge about when and when not to employ it. CCW training may provide some of that information, but now in 13 of the 50 states, no carry permit is required, no training, no certification necessary.
I would argue that from a moral point of view, mere proficiency is grossly insufficient when carrying a firearm. I am not interested in politics or the laws about training/carrying here. I am saying that a person who is able to safely carry and accurately shoot a firearm only is woefully unprepared to use it in self-defense in most circumstances.
Unlike martial arts training, where something is generally better than nothing, mere proficiency with the firearm without all the accompanying requirements is worse than not carrying at all.
In other words, the guy who carries three guns at all times on his person (good grief) and can shoot straight and draw fast, but who knows jack about when, where, how and why they may shoot, how to retain their weapon from a person determined to take it from them, and so on, is more a danger to the community than an unarmed person. I am not claiming Johnny Three-Guns is not also knowledgeable about the above, I'm using it as an example. Three guns. For crying out loud.