One of the classes journalists take in college is the importance of sticking to the facts the who, what, when, and where. The question of "why" is for opinion pieces that aren't factual news but ideology that people like to read to support their own views of the world. The New York Times is loaded with these opinion pieces that they try sell as factual articles.
The only real watchdog I've seen over this last year is Trump calling out the media for their bias and they're hating every minute of it.