I was among the first "batch" of Arizona-certified CCW instructors, when AZ first began issuing CCW permits about twenty years ago, to people who passed a background check, and completed a class consisting of, if I recall correctly, 16 hours of training, comprised mostly of training in the judicious use of deadly force, rudimentary firearms safety, and no mandatory proficiency test, although many instructors included some range time in their own curriculum. This mandatory instruction was imposed by our typically brain-dead legislature, and accepted as a compromise, by CCW proponents, to get the legislation passed. But, many of us opposed this mandatory training requirement (long since trimmed down, and eventually eliminated) because it gave people the false impression that if they had taken the minimum required training, that they had been adequately and sufficiently trained, and so, sought no further training, in most cases (personal observation...).
There's no data to support an argument for the apparent necessity of mandatory, or more, required training, because of misuse or injudicious use of force by AZ CCW permit holders, or, more recently, by concealed carriers without permits, which are now no longer required in AZ.
My personal opinion is that you are an idiot if you carry a gun, concealed or not, without a thorough grounding in firearms safety, the legal use of force and justification for same, and etc. But, last I checked, it's not illegal to be an idiot, a crime hopefully put to rest once and for all by the defeat of the Nazis, and the salvation of many American voters...