I may be alone in this, but all of their talk of pacifism aside, I think Shintoism is still firmly entrenched in Japanese culture. I'm not real comfortable with the idea of Japan having nuclear weapons. I think MacArthur had the right idea when he prohibited Japan from building up their military for anything other than defensive purposes.
You'r not alone on that. But the fact remains a nation will try to defend itself and Japan is one of the biggest users of nuclear power. They could have relatively advanced weapons within a year.
Huh? What does Shinto have to do with this?
The Japanese have been perfectly free since the early 1950s to change their constitution and build nuclear weapons but haven't done it. If anything, they are more resistant to the policies you fear than we are.