People create the illusion of acting natural, which is what I think most documentarians do in part because of the direct cinema orthodoxies that came into play really in the '60s. That moment of performance is a tremendous opportunity to make visible something hitherto invisible, which is how people want to be seen. How do they see themselves? What are the scripts, fantasies, genres by which they imagine themselves? How is storytelling part of what we are as human beings? We wouldn't kill each other en masse if it weren't for storytelling. We wouldn't be able to live with ourselves.

I'm trying to understand how do we tell lies to ourselves to justify what we've done and what are the consequences of those lies? But actually maybe I also recognize that in turning empathy into a practice for many years, by turning, by forcing myself to separate at some level the humanity of a human being from his or her actions and recognizing that sometimes, even the moral aspects of a human being can contribute to immoral behavior.

In a fiction film, we know at some level we've suspended disbelief. In a documentary, we know that we're watching a drama unfold in the world because of the movie we're watching that is real. That has enormous stakes for the whole society, and we, by the act of watching, complete the story.

We lie to ourselves and try to escape that bitter reality by saying that the world is divided into good guys and bad guys, and that we're the good guys. We condemn people as evil to reassure us that we're not like them. If there's to be any hope of preventing these things from happening again, we have to look at the reality. That any act of evil in our history was committed by human beings like us. That, very often, we're all implicated in it.

There's a tradition of reenactment in documentary which is about sort of illustrating what the past might have been like.

Each and every perpetrator was boastful, usually they would invite me to the places where they killed and I would of course accept those invitations because I could document what happened that way.

I always have said, you know it's not for me to forgive or to condemn, I'm a filmmaker.