Glenn Beck sez he's not doin' nothin' wrong.
Blaming TV or radio hosts for the nutjob who killed three Pittsburgh police officers over the weekend is like blaming a flight attendant after a terrorist takes down a plane. In other words: Giving passengers a safety talk to prepare them for a worst-case scenario doesn't mean you are responsible should a terrorist make that worst-case scenario happen.
One person is providing important information. The other is a nutjob who would've acted no matter what.
And the third is a demagogue who says he's just a magical safety pony -- and ponies are good! -- providing people with "important information," like that the government is about to seize their guns, confiscate their property, and possibly force them to eat Alpo. Maybe even gay or European Alpo!
"I'm just a flight attendant! I can't be blamed if a terrorist takes down the plane!"
Real Flight Attendant: In the event of a water landing, your seat cushion may be used as a floatation device.
BeckAir Flight Attendant: Your pilot is Hitler! He's bent on your destruction, and will kill you all! He must be stopped! Save America! Charge the cockpit!*
*Metaphorically, as one might by having a "Tea Party!"
Beck's conclusion: No difference!
(Thanks to georgia10 for the image!)