May we sue the networks for the violence they cause?

May We Sue the Networks for the Violence they Cause?
Local governments around the nation have been trying to sue gun manufacturers to recover some of the costs the lawyers associate with handgun violence. It seems quite a stretch to blame the manufacturer of a legal, inanimate object for the crime its owner commits, but hey, whatever makes money.
And why not try? After all, Big Tobacco has been successfully sued by people got cancer from smoking cigarettes, even though the dangers were well known when they took up the habit.
In many cases, the big television networks have been out there leading the cheers on these crusades. So, how would they react if somebody sued them for the violence they incite?
The most definitive study of its type to date links television violence to physical aggression in teenaged boys. Watching more than one hour of violence can yield up to a four fold increase in violent behavior.
I wonder if the networks would be so enthusiastic about these kinds of lawsuits if they were on the receiving end.