Imagine an empty cafeteria. You and your friend enter, get your meal, sit down, and enjoy quiet conversation. Then two other people do the same thing and, because your voices reverberate in the room, you and your friend begin to talk a little louder. As more people enter, the ambient volume increases until no one can hear themself think, never mind hear the person across the table from them.

That is how advertising seems to me. If only one person hired false witnesses, their hires might rightly be consigned to the eighth circle of Hell where they belong. But because everyone hires false witnesses, it's become an operating expense necessary to overcome the ambient lying.