Terrorism is ultimately another bogeyman, and while a problem nonetheless, I believe that we are interpreting a situational cause (the "Great Game" that has practically never ended, resulting in turmoil in various countries and causing more people to look for extremist solutions to impose order) as fundamental (that Islam predisposes people to terrorism, which is contradicted by a study (Lewis, Bernard, 'Islam: The Religion and the People' (2009), pg. 53) finding Islamic jurisprudence to be at odds with terrorism and a report by MI5 finding Islamic terrorists not being particularly religious or irreligious on average).

The fundamental problem is that when you have a lot of young people who either live in or have active ties to a region that has been screwed over for a long time, you are bound to see increasing numbers of people getting angry about it and thus increasing (but still small) numbers of people channeling that anger into horrific acts (which will, of course, be high profile compared to more statistically significant threats), believing those acts to be a solution, and perverting a belief system shared by most other people from the group they believe to themselves to be fighting for to justify them and popularize their cause.