I don't think anyone from Unit 731 were punished.
@skeeter My memory is better now but it still sucks from the Chemo. Having said that,I think you are right about Unit 731 getting
a pass.
IIRC,I remember reading a LONG time ago that the Allies had to pretend the IJA did none of this stuff in order to
justify giving the Emperor and key aides immunity in order to get the surrender. If the Emperor hadn't gone on the radio and
ordered the Japanese citizens to surrender and obey the occupation forces,it was estimated that more than 100k Allied
soldiers would die to take the islands,and even afterwards would face guerilla attacks. The only way to avoid this was
to give the Emperor and his family and staff a pass,so they bit a bullet and agreed to it.
I am sure at the time if it were known publicly at that time the American public would have demanded Truman be hanged.
I am also guessing if you were to ask the soldiers floating around the Pacific on troop ships and their families,they
would have been all for it.
People today tend to forget that the Nazi's were small part of the German population,and they ruled by fear. On the
other hand,the Japanese worshipped their Emporer as a living God,and had done so for centuries. The Japanese government
didn't have to threaten their people to get them to fight and die. Most were happy to have the chance to die for their
Emperor. After all,he was a Living God.