Juan Cole writes on Salon:It's unconstitutional, un-American — and it might hurt, rather than help, the FBI's effort to stop real acts of terror.The U.S. Justice Department is considering a change in the grounds on which the FBI can investigate citizens and legal residents of the United States. Till now, DOJ guidelines have required the FBI to have some evidence of wrongdoing before it opens an investigation. The impending new rules, which would be implemented later this summer, allow bureau agents to establish a terrorist profile or pattern of behavior and attributes and, on the basis of that profile, start investigating an individual or group. Agents would be permitted to ask