So how do you know Fox News lies? Do they? How do we know MSNBC is telling the truth? Honestly they both are shit in my opinion. But I’m not about to call major news outlets liars. I remember when the media just reported the facts.
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I blame two issues. Firstly, the emergence of cable news networks in the 80's. They'd get "stuck" on a major story and, from there, the temptation to editorialize to keep viewership was inevitable and the lines between "news" and "opinion" got obfuscated. Secondly, the repeal of the "Fairness Doctrine" that required news outlets give equal time to the opposing point of view. This paved the way for news outlets to "polarize".
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The later emergence of the WWW just made it worse.