That's because mainstream media is about who can report first. Journalistic integrity and ethical standards are thrown out the window in favour for vague and/or misleading headlines that pull in viewers/readers for ratings, just to be presented with poor journalism. Part of that is because of increase in the availability of information on the internet. Anyone can search on google, find some information on a topic , and then right a shitty opinionated article.
True, now a lot of nasty and vague news that comes up, they are not the same as those who are pursuing real commercials. For the sake of a high rating now a lot of Hoax news and garbage news is circulating, sometimes troubling and misleading.