The most recent wave of Palestinian terror attacks, now entering its second month, has been mainly the work of “lone wolf” operators running over Israeli civilians, soldiers, and policemen with cars or stabbing them with knives. The perpetrators, many in or just beyond their teenage years, are not, for the most part, activists in the leading militant organizations. They have been setting forth to find targets with the expectation, generally fulfilled, that after scoring a casualty or two they will be killed or badly wounded. What drives these young Palestinians, experts say, is a viral social-media campaign centered on claims that the Jews are endangering the al-Aqsa mosque in Jerusalem and that Israel is executing Palestinian children.