Its been a well-established fact that Hiroshima and Nagasaki were functionally just weapons test sites, conducted for the purpose of intimidating Stalin and discouraging their invasion of Hokkaido by way of Korea.
Even then, one could argue that the firebombing of Tokyo and Dresden (and the saturation bombing of Korea ten years later) were significantly crueler by scale. We didn't need nuclear weapons to break the back of a country. Nor were we reluctant to wage hideous slaughter across a countryside with conventional munitions for the next 80 years.
There are a lot of other german cities which were attacked/razed and were less deserving than Dresden, which became a rallying cry for muh concerned citizens. (Although its sad for the beautiful architecture tho).