Journalism is supposed to limit itself to reporting what, who, when, where, how and why. Fox New isn't the only one that does it, but TV news generally makes the error of informing us of who is right and who is wrong. This is usually done with terminology, for example, if there is ever a war between the U.S. government's adversaries and the U.S. government's allies, we can be sure that it will be reported on TV in terms of "the guerrillas" versus "the freedom-fighters."
Fox News merely makes it too obvious by often using such unsophisticated language as: Unfortunately, some of the bad guys killed some of the good guys; however, fortunately, some of the good guys also killed some of the bad guys.
Even Bernard Goldberg, a conservative writer who complains about the "liberal media", cited Fox for doing this. In his book _Arrogance_, Goldberg wrote:
"Personally, some of Fox News 'fair and balanced' coverage was a little too rah-rah, flag-waving for my taste. I didn't need to hear Shepard Smith refer to the Iraqi soldiers as 'the bad guys.' But the truth is, I can't get too worked up over it." [page 230 of the hardcover first edition, 2003]