Well of course it's not, the us government wants to remind everyone that the bombings were a 'nessicary evil' that bs is still taught in schools. Not being a conspiracy guy but I cant imagine a high budget highly publicized movie would rock the boat like that. If you want to hear about sloughing go listen to the last podcast on the lefts 6 part magnum opus on the Manhattan project.

will Japanese directors show the camps of sex slaves they have in China or Korea? of course not
so there is your answer

They were victims. The nukes were war crimes. Show the victims.

Ultimately though a lot of Nolan's films are coded for a Conservative viewpoint going back to the Batman trilogy. There's still quite a bit of it here, even if this movie is intended to depict the honesty of nuclear weapons.