Was the Ralph Nader who ran for president in 2000 and 2004 a cranky, ego-driven spoiler who knowingly tipped those elections to the Republicans and took a devil's-advocate delight in doing so? Or was he simply a citizen following his conscience? Before I saw An Unreasonable Man, a perceptive and beautifully made documentary portrait of Nader directed by Steve Skrovan and Henriette Mantel, I'd have said, with no small measure of contempt, that Nader was a passive-aggressive has-been trying to stick a monkey wrench into a system that no longer had any use for him.