Last Friday, in Christchurch, New Zealand, one of the more civilized places on earth, 28-year-old Brenton Tarrant, an Australian, turned on his cellphone camera and set out to livestream his massacre of as many innocent Muslim worshippers as he could kill. Using a semi-automatic rifle, he murdered more than 40 men, women and children at one mosque, drove three miles to another, and there killed seven more. Dozens are still wounded, suffering and dying.