A modern civilization requires a minimum amount of maintenance of its infrastructure, the very thing that washington is neglecting nationwide. New Orleans was just the first catastrophe of many to come due to the massive looting going on at the federal level.
Warfare doesn’t require bombs and rockets, the siege tactic works just as well. New Orleans was effectively under siege through government neglect of its levies. Taxes were being paid and yet essential services were not being delivered. They might as well have been surrounded by an invading army preventing food shipments. The effect is the same.