It would have been a great place to put a bomb, were one so inclined. Why? Because no one in their right mind would do that.
It still is, especially now, because no one in authority wants to look like an idiot, right?
At any rate, it looks like the ad campaign has been wildly effective. Now if the perp can just get out of jail and stay out of the red...
It could now be said that the reaction to these ridiculous advertising signs provide real terrorists with a good indication of how they can tie up resources and authorities in multiple areas while hiding and using devices elsewhere. A nice "bait and switch" diversionary routine.