My father served in the Pacific (USMC) as did my uncle (also USMC)
He stated unequivocally that the “bomb” saved hundreds of thousands (or more) lives. Without the bomb an invasion of Japan would have had to take place. Uncountable casualties.
Who should be blamed for the civilian deaths from the bomb?
The Japanese.
But Imperial Japan was a real horror show.
You can go and read the notes from Unit 731 and you will find stuff that will haunt your dreams for the rest of your life.
There is a reason why their neighbors hate them and the reasons are valid. And likely will take another hundred years for those memories to go away.