I found this article about Spike Lee and the making of his documentary in Newsweek. Here is part of the story and the link to read the rest.
But generally speaking, Lee makes sure that "When the Levees Broke" belongs to the spirited, ordinary survivors of New Orleans, like Phyllis Montana LeBlanc, who deserved better than to be called "refugees" in their own country. For them, this documentary isn't over. LeBlanc draws laugh after laugh in the film, but in real life she still panics every time she feels a raindrop. When a storm hits, she runs down the street to a friend's trailer and locks the door until it passes. She'd like to take something for her nerves, but that would require getting in line at 3 a.m. to see a city-appointed mental-health specialist. For her, Lee's film was more than just a chance to tell the world her story. It was therapy. "To be honest, I'm not sure what I would have done if Spike hadn't come when he did," she says. "I had a nervous breakdown right after Katrina, and I was fighting every day not to have another one. But talking about it to someone who I know cared about me and the people who suffered through this—it saved my sanity in a way. And I'm sure I'm not the only one."
It is more from carelessness about truth than from intentionally lying that there is so much falsehood in the world.