Some torture stories are just too horrible to contemplate, while others are too complicated to understand. But Scott Horton's devastating new exposé of the possible murders of three prisoners at Guantanamo in 2006 is neither: It's simply too terrible to allow to be true. Which is why it has been mostly ignored this week in the mainstream American media and paid little attention by the usual crew of torture apologists on the right. The fact that three Guantanamo prisoners—none of whom had any links to terrorism and two of whom had already been cleared for release—may have been killed there...