“Last weekend [April 2007] the Japanese Ministry of Education instructed publishers of school textbooks to alter descriptions of the mass suicide of Okinawa civilians during the battle. The order included eliminating all references to the Japanese military’s direct role in the tragedies, erasing accounts in earlier texts that claimed the Imperial Japanese Army instructed Okinawans to kill themselves rather than submit to U.S. invaders.” https://www.stripes.com/news/okinawans-outraged-by-what-they-say-is-a-cover-up-of-military-urged-mass-suicides-during-wwii-battle-1.62503

This article shows the number of ways in which knowledge changes and the different ways different groups and individuals look at a particular event in very different ways.