L-Frame - I know it runs counter to our current culture but the vast majority of people are good, honest, responsible people. We can see this when looking at the overwhelming gun sales surge in the US over the last few years and no sea of blood in accidental or intentional shootings that should have followed. Many, many non-gun-owners bought their first firearms in the last few years, and there is no mandatory training for them, but they have done admirably well.
Most states allow unlicensed open carry - no blood. Two states allow unlicensed concealed carry - no blood. The same argument was used when Florida passed the first shall-issue law (people just aren't that responsible...) - no blood bath. The truth is that when it comes to guns, there's a lawyer attached to every bullet and that keeps responsible, law abiding people in check. For the irresponsible and non-law abiding people - which are an underwhelming minor that I would rather not have the laws tailored around - they are going to do whatever they do whether everyone else is subjected to infringements on rights or not.
BTW, I believe that mandatory training is an infringement because of the following scenario. Let's say you are a woman that just realized you are being stalked. You should be able to drive by a gun store on your way home, by a pistol and holster, and carry it immediately. Otherwise, any type of waiting period is an infringement on the immediate right to prepare yourself for defense. Plus, guns are WAY simpler to use and be safe with than most people think. Most people can be taught and understand the 4 rules in 15 minutes, and be taught how to use a revolver adequately in another 15. WAY easier than driving a car...