Even the mere threat of Islamic terrorism has for several decades been very effective at steering European nations’ foreign policy. Going back further consider the Germans in the 1930s and early 1940s. A small minority of people living in Europe had an ideology and the will to use violence to back up that ideology. Without a whole lot of effort or actual force they were able to conquer nearly every other European nation and convince those Europeans to accept major elements of their ideology. European democracies appear strong but apparently are easy to control by anyone who threatens to disrupt the bourgeois comforts of the populace. Nor do Europeans have the internal strength to dislodge violent minorities who’ve gained control of their societies. In the 1940s it was the leveling of German cities by the British and American air forces and Soviet artillery that convinced Europeans of the impracticality of Naziism.