Al Qaeda isn't the only terrorist group we're up against. The real al Qaeda — the al Qaeda that attacked us on September 11, the al Qaeda we are hunting in Pakistan and Afghanistan right now — is a dangerous enemy, but it's not the only al Qaeda. There's another, equally dangerous al Qaeda: the mythical, ten-foot-tall al Qaeda we create when we give the group credit for every major terrorist attack, everywhere in the world, heedless of evidence that, in many cases, points elsewhere. The press does that, routinely. In the collective media mind, when it comes to terrorism,...