Japanese are still trying to convince the world (with some success) that they were only responding to an American embargo when they attacked Pearl Harbor. Working all the way down the line to how they treat POWs is probably not going to happen before all these guys die. Sad but true, the state of denial in Japan over the Pacific War is troubling and not going to get better anytime soon.
That being said, they treated their own soliders like crap as well. Almost as many starved to death as died in battle. Especially in places like New Guniea and Burma. What the Japanese High Command did to it's own soliders is criminal.