"No Guns allowed"

I recently wrote about a man who shot to death an armed “gun crazy” who came into a “Dollar General Store” threatening to kill everybody in sight. Turns out that store had a sign on its door prohibiting guns in the store. A lot of good it did them. A crazy man who didn’t care about that came in, ignoring the sign, threatening to kill everybody in sight. Fortunately for them, another customer, who was NOT a “crazy” and also didn't care about their sign was there, too, and killed the gunman. Would they keep their “no guns allowed” sign after that crazy shot up the place and killed everybody? Maybe the guy who put up that sign would be among the victims. That WOULD be “poetic justice.” (Guns)