I don't think the intention of the question was "When should we strip people of their right to carry?" but more "What level of training should a person obtain before they should feel that they are wielding the power to kill as safely as possible?"
...Having said that, there are certain things that an individual should do for
himself for his own good. And, I can also suggest to another person that
they maybe want to get some more training in correct handling of a handgun.
That other person can do with my suggestion what they wish.
I had no doubt that was your intent.
Still happily answering to the call-sign Peetza.
The problem, as you so eloquently put it, is choice.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.