Sir Pterry said it best. What people think they want is news. But what they really crave is OLDS.
And from the same book: "A lie can run around the world before the truth has pulled its boots on".
We all have an inherent bias, and many people want to read things that reaffirm their opinion on how they think the world should be. Somehow a significant number take it as a personal affront to have their views challenged by truth, and just double-down on the crazy.