The point is the WWII Nazis and Japanese are famous for killing / torturing people even after they surrendered.

I'm not saying others didn't, but Nazis and Japanese took it to another level than the west. (Although to be fair Sovjet Communists should be mentioned together with them.)

We kind of still do.

Yes, you are correct, Nazis and Japanese committed war crimes. And the US dropped not one, but two atomic bombs to majorly civilian population centers. Different scales, different philosophy, but mass murder of civilians just the same.

As pointed out many times - under any definition at the time, Tokyo, Hiroshima and Nagasaki where military targets.

On the other other Kyoto was not - and was removed because of that.

The definition of "military target" was an arbitrary definition (like most definitions) done by those who decided to bomb them. Kyoto was also a possible target favoured by the military, and it was replaced by Nagasaki.

And as you know, Hiroshima was chosen because it was undamaged and the effects of the bomb could be studied. So we can add "weapons testing on civilians" to the list of crimes.

You don’t start putting together charges unless you intend to prosecute.

The US will not be prosecuted in the future for dropping A-Bombs on Nagasaki and Hiroshima in 1945. So what exactly is your aim?