There also is no expectation of getting struck by lightning while spectating at the Boston Marathon, yet that is much more likely to happen than getting hit by a terrorist's bomb.
Unless you're trying to say that the odds of being struct by lightning while spectating the Boston Marathon, on a clear sunny day, is high.
Not sure where you're getting your data from.
It's an obvious appeal to emotion that doesn't refute the point that terrorist attacks are so infrequent that the average person ought to worry more about, say, slipping and falling in their bath tubs than getting killed by a terrorist.
So I suppose this would be a red herring on your part, if we're accusing each other of logical fallacies.