Soon after a man ran a vehicle into one of the largest Reform synagogues in the nation, Bill Humphrey initiated a protocol that has become all too familiar. Humphrey is the director of community security with the Jewish Federation of Greater Dallas. Any time there is an attack on a Jewish community in the country, Humphrey’s job is to find out if there is any immediate threat to North Texas. “Is it a coordinated attack? Is it going to come to Texas, to Dallas?” he asks himself. That was not the case Thursday. While security experts and Jewish community leaders...