The Tucson massacre that left six dead and 14 injured, including Rep. Gabrielle Giffords, brought into sharp public focus the local sheriff, Clarence Dupnik. He's been the sheriff of Pima County, which includes Tucson, Arizona's second-largest city, for 30 years. For the 20 years before that, he was a police officer. Dupnik has gained attention this week for linking the shooting to the vitriolic political climate in the U.S., and in particular, Arizona.

Speaking at a press conference shortly after the shooting, Sheriff Dupnik said: "The anger, the hatred, the bigotry that goes on in this country is getting to be outrageous. And unfortunately, Arizona, I think, has become the capital. We have become the mecca for prejudice and bigotry."

While denouncing suicide bombers is the bread and butter of U.S. politics, there was barely a murmur of outrage last February when a suicide bomber flew a plane into a Texas office building, killing one office worker and injuring 13 others.

The extraordinarily muted response can only be explained by the fact that the suicide bomber, Joe Stack, had made it clear his anger was directed against U.S. tax authorities -- an anger shared by many powerful interests on the right.