I think the operative point here, which Weigel makes, is that for conspiracy theorists, evidence disproving the conspiracy is actually evidence proving the conspiracy. At the Windy, Weigel writes that “ironically, the ‘birther’ movement began in response to Obama’s own efforts to debunk rumors." Well maybe. I'd hypothesize that it began as a response to some people's inability to accept a black man as president of the United States.
-- A. Serwer