The media has difficulties countering lies. George Lakoff recommends countering lies with "Truth Sandwiches":
START. Start with the truth. MIDDLE. Indicate the lie is a lie. FINISH: End with the truth. If you don't do that, if you just repeat a slogan and say it is false, it tends to become even stickier in listener's minds.
The media also has difficulties reporting fairly in unbalanced situations. Media want to examine both sides, to be seen by viewers as having examined both sides. What if the news isn't balanced? What if one side does all the lying? When the truth is one-sided, reporters report in a heavily biased way just to look not biased. We should add a "Standards Sandwich" to the "Truth Sandwich."