Meanwhile, Japan has been an ally of the US at least since the defeat of the Nationalist Chinese... Look how 0 has turned on other allies and sucked up to former adversaries.
Plus, we owe the chinese lots of money. The way they see it is we're not really in a position to complain about their conduct.
Oh, and those other countries that we'd wish to see allied with Japan? South Korea, Vietnam, the Phillipines? (Thailand, Singapore, India?) They too have a sense of history that goes back before Nanking. They'll look the other way, just as we will.
“They’ve got a score to settle with Japan, and it goes back a bit further than our memory.”
More recently after WWII, the Chinese wanted to kill every male over the age of 10, turn the rest of the male children into eunuchs, take all remaining Japanese as slave labor, take all the females and sterilize them then use them as prostitutes.
If you think that meant the total annihilation and humiliation of the Japanese, you’d be right.
And that was just for the millions of Chinese the Japanese killed during WWII.