Your statement doesn't make any sense. The firebombing killed just as many people as the nukes. Also the potential of the Nukes had nothing to do with their surrender. I mean hell they didn't surrender after we used the first one and we gave them time to.
The firebombing of tokyo and regular bombing of many german cities caused more death so there really wasn't much of a change except for the ecological effects. Modern atomic weapons are a much different discussion.
Sure the death toll might have been less, but it was meant to scare the Japanese government.
Fire bombing with many planes gave the look that the Americans were risking a lot of planes and men to bomb Japan.
Enola Gay was risking one plane, one crew, using virtually no fuel compared to the fleet of bombers it took to firebomb.
A new non-conventional weapon that could decimate with one small target versus the conventional way.
Let's not use ranking of weapons as our argument here folks. There is history, there were decisions made, the victors write the rules and the history. Sure some people don't like it, and some may even go to revisionist habits so their agendas (in their opinion) can help them feel ok about their new saber rattling. It does not matter, it won't (hopefully) happen again.
It sucks it happened, if a Japanese person who was affected would like me to listen, ok I'll listen, I'll even tell them I am sorry it affected them, I'll mean it they'll see my empathy. I would leave it at that, there is nothing else I can say to comfort, hopefully they take it from me that I do care.
It was a war, like something we will most likely never see again, if we want to survive it as a species.