Palpably illustrating its indifference to the Arab Christian population’s fate, the Palestine Liberation Organization (PLO) unity government on Tuesday largely brushed off the detailed threat by an Islamic State (ISIS) affiliate in Jerusalem to “purify” the city of Christians. The ISIS announcement was posted in the eastern part of the capital city last Thursday, and in it the ISIS affiliate threatened to murder all Christians in the Muslim Arab neighborhoods during the month of Ramadan, starting with Shuafat and on to the Muslim sections of the Old City. It also threatened an attack against the Church of the Nativity located...