I'd be surprised if anyone believed everything the press said. It doesn't even seem possible as different press outlets will say conflicting things. But even if someone did, that isn't really an argument that a free press is an enemy of world peace so I'm not seeing how your point is related.
Let me try. About 125 years ago there was something called the Spanish-American war. It only lasted 4 days so most people forget about it. It was basically started by the press, specifically by Hurst. It is where we get the term 'yellow journalism'.
Basically the press claimed that the Spanish sabotaged a US navy ship called the USS Maine. The Maine had a boiler accident which caused it to explode but the press claimed it was the Spanish. The government used this as an excuse to take the remaining bits of Spain's empire away from them. So that might be an example of the press being 'an enemy of world peace'. No, I'm not sure the current media would do that. But it is an example of a free press starting a war to sell fish wrap.
[0] https://news.gallup.com/poll/695762/trust-media-new-low.aspx