I don't know what everyone expects here.
On the one hand, the dropping of the bomb undeniably brought a quicker end to the war in the Pacfific and probably staved off confrontation back in Europe with Russia. Hundreds of thousands of lives, maybe even millions, were saved in that instant. We had it, we used it, it worked. And it is hard to argue with that logic at all.
On the other hand, the instantaenous and horrible death and destruction it caused is also undeniable. In the blink of an eye, tens of thousands were killed with many tens if not hundreds of thousands more to follow. And they were mostly civilians.
It was a terrible choice to make, either way.
Japan has apologized repeatedly for WWII and admitted fault. I don't think we need to "apologize" for Hiroshima or Nagasaki because we did what we thought was best at the time and a good argument can be made that it was.
I honestly don't think there is anything to say at this point. For them or for us.