There's no way of preventing the media from covering attacks as huge events and until the media stops doing that, they will be huge in people's consciousness, and we have to treat these things differently from the smaller random acts of violence.
terrorism is interesting to a novelist because it's a crime that's driven by an idea, as opposed to some kind of base materialist impulse. It's not like stealing from someone's house, or even assassinating someone. There are very complex ideological reasons behind these almost abstract acts of violence.