In its sneaky, cheeky way, “Defamation’’ is a mitzvah, an act of kindness. A documentary purporting to be about global anti-Semitism that instead becomes an inquiry into how the specter of “anti-Semitism’’ is used by various factions to deflect criticism of Israeli politics, the film wades airily into a cultural no-flyover zone, sits down, and says: OK, let’s talk.
And talk they do: Anti-Defamation League head Abraham Foxman on one hand and Norman Finkelstein, author of “The Holocaust Industry,’’ on the other. Wealthy American Jews and impressionable Israeli high school students. African-Americans in Crown Heights, N.Y., and old Polish guys visiting the death camps. Israeli filmmaker Yoav Shamir has his own point of view but he wears it openly and lightly, letting his subjects do most of the heavy lifting. The results are provocative, in the best ways, which is to say you’ll have some good, loud arguments on the way out of the theater.