Extreme rhetoric can inspire extreme behavior, even violence. But there isn't a shred of evidence that anything that anyone on the political right -- or left -- said or wrote inspired Jared Lee Loughner to launch his deadly rampage in Arizona. Within hours of the shooting, before the blood had been washed off the Tucson sidewalk, New York Times Op-Ed columnist Paul Krugman was claiming that "McCain-Palin rallies" in 2008 and unspecified comments made by "the likes of Glenn Beck and Bill O'Reilly" incited the massacre. Former Florida congressman Alan Grayson claimed that a map on Sarah Palin's website, with target symbols over various election districts, was what caused the bloodshed in Arizona. He and other blame-meisters on the left also have pointed accusing fingers at the Tea Parties, Fox News, and a laundry list of people and parties to the right.