I've thrown out or yelled at cops, CHL holders, military, etc. you name it on the gun range for obviously stupid gun handling. Ultimately what remains common to all of these people is this:
1) They don't pay attention.
2) They don't care.
3) They have practiced poor gun handling enough that it's normal.
These people are not going to be fixed, or learn anything, from a simple CHL class. The CHL class is a dog and pony show for the right to carry. While people that do care, and do pay attention can gain some excellent info from the class, it's up to them to remain up to speed on current laws. In the end, you are changing nothing, and might as well just give the rebate retards their right to carry. Yeah, they'll probably end up shooting someone or themselves, but frankly that was going to happen anyways.
All a CHL or CCW class does is to see if you know which end of the gun you hold and they skim over the basic laws. Not any kind of "real" gun handling qualification. Pretty much a waste of time, unless you have never been exposed to guns before.
I have never seen or heard of ANY state that had a real CHL qualification test. I can't even name one state that even has you draw from a holster in their test.
Like was said, the CHL/CCW is just a "feel good" requirement that states have, so that all the unarmed people will feel better about having people armed around them.
Anyone that has a CCW/CHL knows just how untrained most people really are.