Surf around the web and there is no shortage of charming decapitation videos. But you may or may not be surprised to learn that many of them have nothing to do with ISIS or al-Qaeda. The Setas and Sinaloa drug cartels behead each other’s members. There is one online video of a Mexican drugs cartel beheading two men with a chainsaw. Nigerian soldiers and Boko Haram have both traded online executions of each other’s members.