PHOENIX — The most dangerous place in Arizona right now, the day after a federal judge knocked down the key parts of SB 1070, the state’s proposed anti-illegal immigration bill, is between Joe Arpaio and a camera. Arpaio, the 78-year-old sheriff of Maricopa County (population 3.9 million) has cultivated a reputation for himself as the last true lawman of the West. He’s written two books, the last called “Joe’s Law: America’s Toughest Sheriff Takes on Illegal Immigration, Drugs, and Everything Else That Threatens America.” He has reintroduced chain gangs. He houses convicts in “Tent City,” where inmates remain exposed to...