They are held accountable in law — and have been for a long time. It just needs to be proven that the media source has lied. If the lying can be proved, then the law will take its natural course. read more
The reason why the media cannot be sued so easily for lying is : Topic: New York Times Co. v. Sullivan, 376 U.S. 254(1964), Summary: In 1964 the SCOTUS ruled on New York Times vs. Sullivan. read more