Mathematics (and certain sciences) are one of the few fields where actual facts exist.
Most news, though, deals with with humans, humans' interactions, and so on. You can never know what other people are thinking or feeling when they do something, and oftentimes they themselves don't even know.
If you want to see how bad most reporting is, just see how bad it is in fields you understand. Most reporting about the computer industry is terrible. Just as one funny example of a "fact" by an expert (and ironic who I'm writing this to), pg's article on PR has a footnote about how the damages figure for the Morris worm was calculated.
Great read in any case, which sorta makes some of the same points: http://www.paulgraham.com/submarine.html.
