Honestly, I'm a firm believer in equality, once had a female boss call me into her office for email a couple thousand women bashing jokes to a group of women in the building. Only, she hadn't been told that I was CC'd constantly, by the same people with list after list of male bashing jokes. So, during a break, I copied and pasted a couple thousand into an email and sent them back. She apologized for the double standard, and that was that.
Likewise here, if we're making jokes about Pearl Harbor, I suppose jokes about Hiroshima and Nagasaki are equally as appropriate. (No, I am not saying there's anything funny about WW2, merely providing an example of how equality would work, in this case).