That comment is the queerest attempt at papering over a fiasco: "a cultural difference between understanding what happened in Fallujah in the US versus Japan."
What the fuck is that? There are cultural differences, and there are differences in understanding what happened; there is no such thing as a cultural difference in understanding an event.
Sounds like an oblique way of saying, "We Americans deceive ourselves/don't care about what really happened in Fallujah, while the rest of the world knows that it was a revenge-fueled massacre to punish the Iraqis for killing four American mercenaries."
So the "cultural difference" is that people are morally blind about anything their side does wrong (regardless of who is who), while other people aren't.