Europe knew for years that the current influx of migrants was imminent, but was clearly unprepared for the unfolding humanitarian, logistical and economic consequences. The United Nations High Commission for Refugees estimates that 366,402 refugees and migrants crossed the Mediterranean to Europe this year, of which 2,800 died or disappeared during the journey. Germany, Austria, the U.K. and France have agreed to take in refugees from Syria, Iraq and other conflict-ridden regions, while Australia said it would take in 12,000 migrants. With no end of the influx in sight, calls are for a globally shared responsibility to accept and resettle the migrants. To be sure, other challenges abound. One is the staggering scale of the humanitarian aspect of the crisis — with migrants dying in transit or living in unsanitary camps — which demands immediate attention. Resistance from local populations to migrants is another. Fears are rising over the Islamic State and terrorism expanding undercover.…