The best thing to do here is to ignore it. Whether or not they can convince people that games cause violence is irrelevant. Eventually, gaming will overrun them with economics and lawyers.
Games are a billion-dollar industry, and that number is only going to climb, especially with economies worldwide ready to recover from recession. It provides jobs to thousands of people and gets money moving in the market. If talking heads really become a problem, the big publishers will release their lawyers into the world and start charging people with various slander-related crimes. The actual grounds for the case may not be enough to win, but the threat itself could go a long way to getting networks to think twice about financing and clearing anti-gaming episodes.
Though another massive industry, tobacco, has fallen to media criticism, gaming doesn't have any definitive data about its ability to do harm. Every study that says that games turn little innocent children into murderous gangbangers is countered by one that says there is either no effect or a beneficial effect on intelligence, learning ability, coordination, dexterity, etc.
So basically, just wait. This may convince some people, but it won't convince the people who matter. Eventually, the anti-game lobby will be drowned by publisher counter-arguments or simply fade into obscurity.