The movie, from 2012, is equally fascinating. Hardly anyone outside of Argentina knew the truth until now.
I have not seen the film, but the public are in the nasty habit or believing what they see on the screen. While most film makers have good intentions, sometimes they can be fooled, just like we all can. The film "Midnight Express" is a classic example. Many other films claiming a definitive answer have flaws. Some are debatable, but others are clearly wrong.
