“Flyboys” by James Bradley is a book I highly recommend. It will open your eyes to the Japanese atrocities on our American pilots in the Pacific theater.
Rough read but definitely worth reading. It will give you some perspective of what was happening on the mainland Asia during the Japanese occupation
Unit 731 makes for interesting reading. What they did would make Dr. Mengele blush like a schoolgirl.
I don’t view it as a competition of who endured the most brutality nor who brought on the most. It was done in history, and is done now. Including the U.S. I believe it’s still pure evil on humans, done by humans. Can some be rationalized is the question (for me). Don’t think I’ll ever find that answer until I meet my maker… for myself.