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Dave Winer has heard that, "they have parties where someone says to the host that if they invite Dave Winer they won't come." Of course, we all learned to pretend to get over this in high school. And of course we never did. Not really.
Tim Bray points out that the phrase, "user-generated content," is ugly and incorrect. It's not generated, it is written and spoken and sung and crafted. They aren't users, they're people.
And they are us.
People lie, cheat, and steal. They can be selfish and destructive and sloppy. And they can be brilliant and generous and delightful. It's a big world. Don't assume that people always mean what they say.