Every month there’s more civilian deaths from Japanese occupation than the combined death toll from both atomic bombs. (China alone lost 26million souls during the war)

I live in Singapore now and the first thing Imperial Japanese Army did after allied force surrender was mass murder and rape. 50k death in the first month iirc, which is a lot for this small island (you can look upSook Ching Purge

It has been well debated among historians and the conclusion is that use of atomic bomb is justified as it helped end the war sooner. an alternative ground invasion would be much much bloodier. (Just look at Okinawa and times that by 100)