My late father was sitting on Okinawa with a few other guys preparing to invade. He was sent to Tsingtao, China to pacify the place instead.
My late dad could have told anyone, without resorting to trumped-up or manufactured propanganda after his 4-year stint in Japanese POW camps, that the Japanese military was "extremely cruel and depraved." The only Japanese plan for POWs (in only mild preference to "take no prisoners," i.e., kill them on the spot) was to get whatever work output they could from them in their stored-up body mass, subsidized only slightly by meager rice rations. When the POW's body mass was depleted and their work on earth was ended, they were simply expected to die, according to the calculations done long before.
Compare that to how Gitmo detainees have been treated.
HF