Earlier quoted context omitted.
Does it matter? It was probably obvious to the scientists working on the bomb that other countries would get it too sooner or later, including countries at odds with each other.
I don't know. Could Hirohito (Suzuki, etc.) have been convinced by bombs dropped elsewhere? (our physicists were able to back-of-the-envelope; should their physicists have needed hundreds of thousands of civilian deaths to calculate what an A-bomb could do?) So I think it's not obvious (multiple books have been written on the subject) what could or should have been done or not done back then; now, from my point of vi…
Personally, I think it was tragic, but there was not much choice. Forcing Japan to its knees by conventional means would have been a prolonged bloodbath (with the Soviets getting in the game as well), with probably a higher death toll.