OP, I haven't RTFT, because I haven't the patience. I have however changed my user name, because what I am about to say will be very outing.
I would suggest that you catch up sharpish on the history of Asia under the Japanese, c1930-1945. The Japanese were brutal in China. They carried out medical experiments on many, many human beings, who they referred to as 'maruta' - logs. They killed thousands when they took Nanking.
I know the most about Malaya. My father's Eurasian family was there when the Japanese army came ashore (not having declared war). They were utterly, horrendously brutal. Somewhere over 20,000 Chinese were killed in what was call the Syonan Daikensho - the Great Singapore Inspection - in the course of about a month just after the fall of Singapore. Other Chinese were killed up and down the peninsula, in their hundreds and thousands, at least one whole village rounded up and the buildings set on fire with the people inside.
My own family had a terrible time. My father's father was killed when the ship in which he tried to leave Singapore, packed with civilians, was shelled and sunk by a Japanese destroyer whose captain knew that there were hundreds of civilians on board. My grandmother was interned and came out weighing about 5 stone. One of my uncles was recaptured with some others after escaping from a POW camp; he was beaten repeatedly and finally executed. It was botched, and none of the men was killed outright by the firing squad, they all had to finished off by an officer with a pistol (iirc).
My oldest cousin was also a POW (he was very much older than me). We don't know how he died, because the Japanese falsified the records of the camp he was in (Labuan - no survivors, none, not one) - to disguise the massacre at the end of the war, when the death marched the last of the men and finally shot them. Another cousin had a narrow escape from being forced into prostitution.
You think that's bad? The worst story of the lot was my father's uncle and aunt. They and another 60 or more people were massacred at the rubber estate where they had taken refuge. Men, women, and children, including babes in arms. Killed in cold blood, with bayonets. Nobody knows why: again, no survivors. At about the same time, there was a massacre of dozens of Chinese on a nearby pineapple estate.
Repeat that over and over and over again, through China, Burma, what is now Vietnam and Laos and Cambodia, what is now Indonesia, what is now Malaysia. Asians were chipped off in their thousands to work on the Burma-Siam railways; thousands died. Javanese were shipped over to work in Singapore. when the work ran out, the Japanese turned them out to starve in the streets: I used to know someone whose brother's (cousin's?) job at that time was taking a handcart round to collect up the bodies. By the end of the war, about 10,000 people A DAY were dying of starvation across Japanese-occupied Asia. The Japanese people were being urged to fight to the last man, woman and child. One faction in government was desperate to continue the war, and orders had been issued for the killing of all prisoners of war. All of them. Tens of thousands of people. In places, Japanese army supply lines had collapsed and the troops were (and this you will not believe, but plenty of accounts attest to it) eating their Indian POWs (see John Baptist Crasta, 'Eaten by the Japanese'.
So before you start feeling too awfully sorry for the Japanese, consider all this. Consider also that ALL Japanese war dead - including the war criminals like the man who was probably responsible for the death of my cousin - are enshrined at Yaukuni, and influential Japanese politicians still go and pay their respects there. Remember Shinzo Abe? Yup, he did.
I think the atom bombs were terrible, but I think that on balance they saved lives. I don't blame modern Japanese for what their forebears did. But I can't bear people condemning the Allies for the atom bombs when they have no idea what Japan did in Asia, mostly to Asians but also to tens of thousands of European and Indian POWs.