RIYADH, Saudi Arabia - The last time Ahmed al-Shayea was in the news, he was in the hospital at the Abu Ghraib prison in Baghdad, being treated for severe burns from the truck bomb he had driven into the Iraqi capital on Christmas Day, 2004. Today, he says, he has changed his mind about waging jihad, or holy war, and wants other young Muslims to know it. He wants them to see his disfigured face and fingerless hands, to hear how he was tricked into driving the truck on a fatal mission, to believe his contrition over having put his...