memes

The Soviet Union had already invaded Manchuria and annihilated the Kwantung Army. We can argue tit for tat about which part of the final days of the Pacific War contributed the most to the final surrender of Japan. It's clear though that no single part of that was enough and it was the combination of the firebombing of Tokyo and Osaka, the destruction of the remaining IJN fleet strength at the Battle of Tsushima, the Soviets invading Manchuria, Korea and the Northern Islands, and the atomic bombings of Hiroshima and Nagasaki.

Although there are records of some of the civilian government campaigning Hirohito and Koiso for unconditional surrender, the main war cabinet still refused and preferred the path of a final confrontation.

I think it's impossible to say if the atom bombs hadn't been dropped whether they would have in fact surrendered, given that all the other things listed above were true after Hiroshima but before Nagasaki and they still were arguing for a negotiated settlement when no opposing force (USA, Commonwealth or Soviet Union) were prepared to accept anything less than an unconditional surrender.

Also, if you want more details on the extraordinary level of depravity by Japanese soldiers during the Second Dino-Japanese War and the wider World War 2 I can recommend reading Rape of Nanking by Iris Chang, Japan's Infamous Unit 731 by Hal Gold and Hidden Horrors by Yuki Tanaka, all of which contain first hand accounts and then you can try comparing and contrasting by accounts of those carried out by Allied forces in the conflict and give me your false equivalence then.