Similar to the regular fall of the Democrats, Brian Williams positioned himself as a figure worthy of our trust nightly. He convinced us that we could believe what he had to say. And he was effective. Maybe it had something to do with the pity-inducing tilt of his eyebrows.
So, when it was revealed that he'd fabricated a heavily promoted story about his exposure to a warzone, he fell harder and further than someone without that trust would have.
Brian Williams became another figure in history whose primary role was to illustrate the undoing of the dishonest. He showed us that when you lie, you should do it in relative isolation without the potential for others to refute your claims.