McCarther pardoned all of the Japanese criminals that conducted vivesections of our troops? What was with that guy?
Yes. He didn’t do it on his own, though...that directive came from above. It was a general amnesty. (and I generally dislike MacArthur)
I wasn’t alive then, but the mood after the war was, in some circles, to move as rapidly away from it as possible and forget about it.
An egregious example of this injustice was described in the book and movie “Unbroken”. The prison guard officer who murdered men faked his own death, but came out into the open and became a successful businessman after the amnesty.