Your argument boils down to "everything is political". I understand that some people think this -- but I don't.

I believe the goal of this writing is to convey to the reader the scale of the bombings and some fraction of their effects on the populace. A secondary aim is to evoke emotion in the reader. I think that's it, I don't see a political aim.

It's facile to say "war is immoral". Inasmuch as anything is immoral, war certainly is. But it's unclear to me how we ought to apply that axiom because it's unclear to me that the world would be better off today if the US hadn't entered the war, or the atomic bombs hadn't been dropped, or if the Allied policy had been something other than pursuit of unconditional surrender.