You say "should". Who guarantees that? News outlets are for profit organizations. If they judge "not guilty" as something that doesn't sell as well as "guilty" then they won't publish so much content about it, and because of Google's algorithm that latter won't be ranked very high.

Even if it's ranked high, a lot of readers would still end up with this feeling that "yeah the latest news article say that but MAYBE that guy DID do something wrong... let's not hire him just to be sure", i.e. "where there is smoke there is fire".

I just gave you a practical example about the plastic surgery meme. News articles about how the woman was ruined rank nowhere near as high as the meme itself.