Sad at the individual human level, I got that.
I was a kid in Japan 1956-58. We played baseball with Japanese kids. Hadn’t a clue about Pearl Harbor until later. People were just people at street level. Our WWII Dads didn’t talk about it. The model airplanes we flew had red suns on the wings.
Mom & Dad hosted sukiyaki parties in our quarters. We read “The Magic Listening Cap” in school. Took field trips to Kyoto and the Buddha of Kamakura.
Learning about the Bataan Death March and the Rape of Nanking came much later. Knowledge about Japanese human experimentation came even later than that.
Japan still avoids teaching about their militarism and atrocities from WW2. Maybe out of shame and denial.