As more and more examples of O'Reilly truth stretching come out (TPM has 7 examples today, the Daily Dot has 99), Bill O'Reilly is starting to feel the heat.
Nothing will happen to him at Fox News, of course, but he's getting very ticked off at the "hatchet job" of the mainstream media. Unfortunately for Bill, these are all pretty easily disprovable things that he said. He's starting to sound like Bill "depends on the definition of is" Clinton when he tries to explain them.
When you live by the hatchet (is there anyone who hatchets people more regularly? he calls people pinheads nightly), you are bound to be wounded by the hatchet yourself. Luckily for Bill, he makes a ton of money for the network, and that's the only thing his bosses care about.