I think the issue is not the fate of the CCW who doesn't know what he is doing but the fate of those around him who get hurt by said person's actions.
I fully agree that any individual wanting to carry a firearm should seek training. The con to not requiring training is that we then have to rely on social pressure/culture to convince CCW holders to get training on their own.
Personally I am on the fence on this issue. I have given quite a bit of thought to how you could strongly incentivize training without having to pull the trigger on letting the government start putting in more requirements.
In Japan during covid everyone wore masks all over the place, but it was never actually a law, The Japanese just did it out of respect and responsibility.
I think I qualify as a "master scientist". In my studies, the biggest, lingering question is: "What causes crime?" The science was invented around 100 years ago, since then, no one has been able to answer the question definitively.
However, there seems to be two common factors for crime: 1) Population density; 2) Socio-cultural factors impacting behavior. The more people there are in a geographical area and the weaker the social bonds of society at large, the more crime there will be. We have more than 330,000,000 people in America, most of which are packed into a few zip codes per state. To make matters worse, a lack of social bonds, accountability, and unity towards 'healthy' common goals in the general populous of America are really the driving forces behind our crime rates. We are literally battling for the polar extremes in this country rather than a sensible middle ground and that is a good indicator we're falling apart from the inside.
Despite the Japanese having some "curious" sub/microcultures, I think the Japanese macroculture as a whole would probably lead to less crime than rates seen in America assuming they owned the same amount of guns as we do.