London. Paris. Madrid. New York. Why are these the cities terrorists have targeted? Perhaps because, say, a Londoner who dies in a graphic way will cause more notoriety-- i.e. stir more terror-- than a Bangladeshi. It maximizes their bang for... uhh... their bang. Given the size of the world's suicide problem, starvation problem, poverty problem, rape problem, etcetera etcetera, of course terrorism actually isn't of much relative consequence. It intends to make people like you freak out, viscerally (just as CNN et al does when they cover these so much).
I'm not changing a damn thing in how I live my life, and not even out of courage (i.e. the "we can't let the terrorists win" bromide that took over in America in late 2001). It just shouldn't matter that much to you, and it only prevails insomuch as you let these irrational fears get to you.