In Germany last week, the vice president of Bavaria’s intelligence-gathering agency, Manfred Hauser, announced ISIS “hit squads” had entered Europe with the flood of migrants that came across the borders over the last year and a half. According to Hauser, there are hundreds of reports that these kinds of terrorist cells have infiltrated European countries, and “irrefutable evidence that there is an IS command structure in place” that will “likely” launch a coordinated attack on Germany. It appears ISIS took advantage of Europe’s generosity by concealing its fighters in the mass of people desperately seeking a new home. If this...