Feathers began flying last Friday hours before Arizona Governor Jan Brewer signed the country’s strictest state law governing illegal immigration, when President Obama called it unfair and promised to have the Justice Department examine it for possible civil rights violations. Criticism of the new law has been fierce. Much of the criticism is, I think, overblown. It is difficult to regard the law’s requirements as deeply unjust. The law begins with a statement of intent: “The intent of this act is to make attrition through enforcement the public policy of all state and local government agencies in Arizona. The provisions...