Interesting take.
In itself, not that pernicious. But Spielberg makes his arguments with his wishful thinking and lies as the premises. Imagine, for example, putting words in Golda Meir's mouth that she would never have said (and can not now defend).
Munich is disinformation of the worst kind kind (to borrow a phrase, perversely, from a Spielberg flick about both benignity and intelligence).