U.S. President Barack Obama was told about the plot in April, and the attempt "underscores the necessity of remaining vigilant against terrorism here and abroad," the White House said.Well, duh. Make sure you lock your doors, and remember to wear your galoshes, kids, because it's raining. This is what people do regarding bad things that may happen to them: remain vigilant. For example, I "remain vigilant" against muggers: This means that I stay alert and wary. I don't declare a "War on Mugging" and run around shooting every shifty-looking character between Broad Ripple Avenue and 49th Street.
Declaring war on a noun is pointless and unproductive. You get folks in the wrong mindset, you can't eradicate it, and you wind up going through ever more pointless and draconian steps to try. A War on Terror is ultimately destined to be as fruitless as would be a war against any other wrong: A War on Murder, say, or a War on Shoplifting, or a War on Telling Your Neighbor That Dress Looks Great On Her When It Really Makes Her Look Like An Avocado In A Flour Sack.
Seriously, if you want to eradicate a noun, don't call the J. Edgar Hoover Building or the Pentagon; call Merriam-Webster.