Dear terrorists;
The people you killed and maimed today have nothing to do with your war. They were innocents, with people who love them, people they love/d, dreams and fears, children and boyfriends, girlfriends and wives, husbands, mothers, fathers, sisters, brothers and friends, and they themselves were all these things too.
You did not win your cause, but you disrupted worlds, caused grief that will never end for some, fear that will live on forever for others, and again, these people had nothing to do with you. Your act was selfish and petty and mean.
You may have intended to make a point, but you did not. You may have imagined you were fighting for some glorious cause, or that you were defeating some great satan. Neither is true.
What is true, is that you caused pain beyond belief, set back immeasurably, whatever cause you represent, and for some innocent people who had no quarrel with you, and perhaps even sympathized with you, you brought their entire universe to an end.