The Slaughterer’s brand of radical Islam was brutal even by jihadi standards. Under Mr. Zarqawi’s command, Al Qaeda in Iraq executed so many hostages and killed so many Shiite civilians that Al Qaeda’s leadership reprimanded him. But in his public displays of emotion, He Who Weeps a Lot was not an aberration. For radical Islamists who view crying as a sign of devotion to God, communal sobbing is as common as car bombing.