Respectfully, I must disagree. I have had the occasion to use my firearm in defense of myself at my place of business. I did not shoot. I have served on juries in judgement of negligent shooting cases. I have seen the prosecution bring full legal and emotional weight to bear on that case against a 50+ woman. She lost.
I consider training necessary and its requirement not an infringement depending on the authority of the certifier. I think training should be with a persons state pistol assn. and they are the certifying authority. The data would be private and restricted to government access only by warrant.
My training was from my father and an uncle (a sheriff) as well as the NRA and the U.S. Army. The training gave me calm as I looked down the sight of my pistol at another pointing his at me. He turned and ran.
If we refuse to be trained we will eventually loose the right to be armed.