Why Didn't George Tenet Just Resign?

Does this sound familiar? A senior Bush administration official plays a key role in selling the Iraq war debacle to the American public, resigns a few years later, and then tries to distance himself from Bush and the war by writing a book or talking to Bob Woodward, portraying himself as a poor, hapless victim who knew the truth at the time and really, really wanted to tell it, but, somehow, just had no choice but to go along.

What else could he do? Each story shares the same fatal flaw. It requires that the remedy that was readily available -- resignation -- did not exist.