Indiscriminately bombing civilians was awful. I’m not going to say it was anything but.
That said, it was not defined as a war crime at the time by any of the conventions of war to which the warring powers were signatories.
A second point is that the Axis started it. They bombed Warsaw, Rotterdam, Shanghai, London, Coventry and lots of other places on a large scale before the Allies started returning the favor on Axis cities. Its horrible for the civilians in those cities but their own regimes are to blame for it.
YOU ARE WRONG. The USA nuked two jap cities and killed several hundreds of thousands of civilians and saved hundreds of thousands or maybe millions of other people both US citizens {the good guys} and japs, the assholes that started the war with the USA, with a sneak attack on civilians.
Awful, hell no, it was merciful you bleeding heart sissy.
War is awful, but once started, you cannot cede a single tactic or give up any advantage to the enemy.
I include torture and do not give a fat rat's ass about the Geneva Convention, which means we play by rules, and the enemy laughs as they cut the balls {or nipples} off of any American they capture.
Waterboarding is not even child's play when it comes to what our enemies do, and we wail and cry about our folks dripping a little water on someone's face. Bullshit.
Nuke all enemies, government civilian centers first.