WITH Israel at war with Hezbollah, where, you might wonder, is Al Qaeda? From all appearances on the Web sites frequented by its sympathizers, which I frequently monitor, Al Qaeda is sitting, unhappily and uneasily, on the sidelines, watching a movement antithetical to its philosophy steal its thunder. That might sound like good news. But it is more likely an ominous sign. Al Qaeda’s Sunni ideology regards Shiites as heretics and profoundly distrusts Shiite groups like Hezbollah. It was Al Qaeda that is reported to have given Sunni extremists in Iraq the green light to attack Shiite civilians and holy...