both sides killed millions
we dropped atomic bombs on civilian populations
we also sent regular bombing raids in to tokyo that decimated them
but its the victors who always right the treaties, post WWII the japanese military was ZERO threat, but victors always require the losers to dissolve military forces, its safest.

and they arent growing their forces, they are merely commiting troops to humanitarian and peacekeeping missions. they arent involved in direct troop actions nor do they have overseas bases of any sort