You keep posting the same graphic with the information that the bridge is the dry route to safety, and with Algiers, on the other side of the bridge, as dry area with food, water, and shelter. The bridge was closed by armed cops, and Algiers was, therefore, inaccessible.
How was the town with less than fifty standing police officers going to manage a crowd of 40,000 - 50,000 (a population greater than the town)?
If the small town didn't have the resources to care for this massive influx of hungry and angry people, where were they going to walk to next?
Where were these 40,000 - 50,000 people going to go on foot that would be safer then the surrounding area?
The local law enforcement and government which had a 100 times the resources couldn't provide care, what makes you think that this small squad of police officers could?
Next, I can show you tons of pictures of dry land near the Convention Center and Dome (see a few below)! If you want to get mad, aim your anger at the Local and State government!