Errol Morris' weblog post at NYT has some interesting discussion about the complex role of re-enactments in documentary film:

Critics argue that the use of re-enactments suggest a callous disregard on the part of a filmmaker for what is true. I don’t agree. Some re-enactments serve the truth, others subvert it. There is no mode of expression, no technique of production that will instantly produce truth or falsehood. There is no veritas lens – no lens that provides a “truthful” picture of events. There is cinéma vérité and kino pravda but no cinematic truth.

[via artblog]