I think it's more about being media literate than "trusting" or not trusting the mainstream media. There are classes you can take to learn how to read what little things these shows and news reports do to bring ratings. Yes, news channels and shows do operate on ratings--shocking! But not all of it is a lie. You just have to be well-versed in the business that is media in order to be able to deconstruct and understand the hidden meanings.