Kevin Drum at Mother Jones has an interesting take on the nature of public debate. The argument is that truthfulness, being factual, etc is strategically disadvantegous in terms of winning public debates and narratives:
Public debates, including their gruesome modern variant, the three-minute hit on cable TV, aren’t about that. They’re solely designed to influence public opinion, and you keep score at the ballot box. Nobody cares if Ron Paul is technically right about the Romans debasing their currency, and nobody cares whether that really has anything to do with the modern global economy. All that matters is whether he’s found an analogy that moves a few of the rubes to his side. Truth isn’t just an obstacle in public debates, it’s a handicap.