America academia doesn't ignore things that are shameful in it's history (despite perceptions). For my thesis in college I spent a year studying differential behaviors between Into-European colonialism and Amerindian genocide. My son (a 7th grader) is learning about chattel slavery right now.
Japanese text books generally don't mention World War II beyond "we attacked Hawaii and got unfairly nuked in return". The Japanese historical community is remarkably unengaged from international scholarship on world war 2. This has been commented on at length from the rest of the international community. It causes massive friction today in South East Asia.
You keep casting aspersions with no factual basis or external authorities.
And certainly realize that the decision to use the atomic bombs was not made in Tokyo. Their strategic use was not defined by Stalin.