One thing I would add is that the aftermath of the Japanese bombings have been extensively covered in various movies, anime and other media including the traveling Hiroshima atomic bomb museum. It is very important for people to understand what the tragedy that the bombings lead to. But that's an entire movie in and of itself.

Go watch Grave of the Fireflies or Barefoot Gen if you would like to know more.

Edit

This is a great quote that I agree with:

“I don’t think we should depend on Hollywood to tell our stories with the nuance and the depth and the care that they really deserve,” Nina Wallace

Her point is that it's not Nolan's fault that he didn't make the movie about the victims, it's that he wasn't the right person for it. It's a systemic issue that Hollywood hires predominantly white male directors to make movies. They would need a different director who is conscientious about the subject matter to go make the movie about the victims. Of course, there are already movies about the victims that have been made in Japan...