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If #2 is true — if talking about this kind of thing seriously actually does produce a change in the salience of the risk — then it may be a precondition to getting mass action or support for #1. That's part of the thesis of the Reinventing Civil Defense project.
So rather than being counterproductive to the task of reducing the possibility, serious discussion of the aftermath of an attack (including civil defense) may be important to supporting it. And there is lots of evidence that just emphasizing the horror just shuts people down.
