Twenty-two jihadists were killed and fifteen were injured after their teacher, who was teaching them how to detonate a suicide bomb, detonated a suicide bomb strapped to his chest. The jihadists were members of “the Islamic State of Iraq and Syria,” a Sunni terrorist group that looks to have Islam control both of those nations. They have bombed multiple locations throughout Iraq. On Monday, the only people they were killing were themselves. The instructor, who was not named, was explaining to a class of new recruits how to carry out a suicide bombing. Somehow unwittingly packed with explosives, the teacher...