Man on Wire (2008)
Director: James Marsh
You'd be hard-pressed to find a film with more humanity than James Marsh's Man on Wire, which tells the story of Philippe Petit, who walked a tightrope between the World Trade Center's Twin Towers in 1974. The generosity of spirit displayed by Petit's beautiful (and illegal) act takes on special significance in light of the destruction of the Towers, making the film even more emotional.
Really, if you need to find a glimmer of hope in a nasty world, Man on Wire will convince you that being human in the face of oppressive superstructures is possible.