For the many many reasons listed on this thread. They echo my feelings. Moore had control. O'Reilly crapped his pants.
I saw the interview too. I wrote on the thread that BOR should have been hader on his lies.
But any semi-informed person could see right through Moore's bluster as hollow and ignorant. He was not convincing at all. "Controlling" an interview means nothing if it just exposes you as a moron. That is what happened in the interview.
Moore could have been exposed even more had BOR been more aggressive, but he didnt come off well at all.