Japan did some truly horrible things during WWII. Should we have stayed at war with them forever until there was justice for every wrong that they did?
This is not about Japan and WWII.
We did not praise the criminal military henchmen of Japan, to get peace. We made them surrender.
It was an entirely different situation, as was the post WWI era AFTER Japan surrendered. Very different than the U.S. and North Korea today.