When disaster strikes, and you have to walk out of it on foot, make sure you know which bridges pedestrians are allowed to cross. Otherwise, you may run into trouble with the police. That's the newest explanation for authorities stopping on-foot evacuees from leaving New Orleans in the days after the flood in 2005.
Those actions say: "No, we're not going to help you. We're not even going to let you leave. You have to go back into a flooded city with no food, water, electricity, sanitation, or medical help because foot traffic isn't allowed on the bridge. Too bad you didn't have a better evacuation plan in place before hand, folks. Now move along before we gun you down."
Shame isn't a big enough word.