I firmly believe that the repeated warnings from the government largely are being done for political purposes, and not because it will really help make people safer.
But I agree that, for instance, a single nuke in New York City, taking out every place I just mentioned and many more besides, would go a long way towards distorting any possible statistics.
However still additional vigilance against car accidents gets a better return for the effort for most people than freaking out when they see powdered sugar on a table in a restaurant. And given seatbelt usage rates, the public has a long way to go towards basic car safety...
Cheers,
Ben