Look at it this way...."liberal" media has 10-15 big outlets pumping out the news. If the idea of a "liberal media" is to be believed then that's means liberals can get their news from any one of 10-15 outlets, and even mix-and-match ideas and stories from various outlets to form their opinions.
Conservatives have only 1 media outlet. Therefore, there are no opportunities to cross-reference or shop around for multiple reports of the same story in order to forma well-rounded opinion. Fox knows this, and they know that ANYTHING they report will go unchallenged and unquestioned because they have a monopoly on conservative media. Because of this, they publish outlandish stories and act as a propaganda machine for Trump which sews discord, disinformation, and violent rhetoric to tens of millions of conservatives.