The other media have gotten by with it for too many years.
Does that not seem typical? For years networks would lie in order to push their own agenda. For example, when visiting a homeless shelter (only in years when there is a Republican in office) the networks will pass by and step over the drunken bums, the prostitutes, the drug dealers, and addicts to find the one family in 500 people at the shelter who are clean cut, white, and honestly down on their luck to show that the people out in the street are "just like us".