The easy angle is product placement [1]. Literally fork over a small sum of money and you get the news org to rave about your product without doing any verification.
There's also how a headline is not written by the author so it won't always reflect the contents of the article.
> And a lot of the times is just because news are not validating their own beliefs
IMO, the news orgs have a symbiotic relation with their viewers. The viewers want their viewpoint reinforced and the news org wants views. So the news org put out a biased product so that their viewers will selectively watch that news org. However, this still means that news org aren't actually trying to inform.
My biggest gripe is how often they'll refuse to link to actual legal documents when talking about filed lawsuits and the like and in general I don't find some of their claims in the article to be as supported by the actual filings.