Let's imagine it's August 2001. And let's pretend that the Clinton Justice Department never erected the procedural war that, to borrow the words Deputy Attorney General Jamie Gorelick wrote in 1995, went "beyond what is legally required" in obstructing communications between the FBI's intelligence division and its criminal investigators. As a result, let's say the FBI connects its dots. When an intelligence agent realizes terrorists Khalid al-Midhar and Nawaf al-Hazmi (two of the eventual 9/11 hijackers) are in the country and asks the Bureau's criminal division for help in locating them, headquarters encourages a cooperative effort instead of turning him...