I did not want to be brainwashed by Spielberg, so I checked out the book: Vengeance
I wanted a more accurate version. Never went to the movie.
I don’t think there was moral ambiguity in “Munich”. It was pretty clear who the terrorists were. That said, it did show that killing people, even terrorists, isn’t totally clean. I guess there are plenty of action flicks where it’s black and white, though.