its a debate topic: WHY SHOULD JAPAN BE ARMED? I AM IN AGREEMENT THAT Japan should be armed. but am not a historian any ideas or reasons i can state.
unfortunately, I don't have the answer you nid. Japanese do not deserve to have army. If they do, it's another war.(although german do allow to have their army.)
I believe there was some amount of racism in the fact that Germany was allowed to have some kind of an army while Japan wasn't. I think Japan is not that keen about having an army right now since an army much more government expenses and much more taxes to support it.
Japan is under its own constitutional set by MacArthur, where it can only maintain a self defense force. Its been roughly 70 years and I feel they have the right to up arm themselves, mainly at the threats China, North Korea And even Russia have made in recent years. They did recently launch a heli-carrier to bolster their navy.