Time for a Pratchett quote: "A lie can travel round the world while the truth is getting its boots on." It takes a certain amount of time to respond to an untruth, let alone refute it; meanwhile, the liar (or bullshitter) has emitted forty-two more untruths, each of which needs a separate refutation.

.... Hm: it's only just occurred to me that "spin doctor" may reference a web of lies, not just spin bowling in cricket. I'm slow.