The main news networks such as Reuters, AP, CNN, Fox and MSNBC are all owned and controlled by powerful people who stay in power by making money. It is no secret that these people have it in their best interest to deliver news in a way where it works to their advantage. There is no incentive to deliver quality news if these corporations make less money by doing so.

The mainstream media is great for "problem, reaction, solution". The corporations will figure out whatever it is they want to push, such as go to war with another country to gain natural resources and keep the public in fear and servitude. So they will fabricate a "problem" that will get a desired reaction from the people watching the news. People are much more apt to believe something on television because they couldn't imagine a large company lying to them. So they will be fed the propaganda all day long for weeks or even months before finally becoming conditioned to give the desired "solution" to the problem.

It is all marketing. People buy things that are marketed to them, the same goes for news.