Some Japanese officers take responsibility very seriously.

>Hitoshi Imamura was a Japanese general who served in the Imperial Japanese Army during World War II, and was subsequently convicted of war crimes. Finding his punishment to be too light, Imamura built a replica of his prison in his garden and confined himself there until his death.

https://en.wikipedia.org/wiki/Hitoshi_Imamura

Most just ordered horrific atrocities, their men to die, and then killed themselves.