Here in Central Louisiana, I've noticed that the highest risk for violence is usually at the dawn of any disaster. I've lived in the area for nearly 8 years now, and there hasn't been a shortage of natural and/or economic disasters yet. It's normally during the "Hey, you need to get your stuff together and leave or button up and prepare" phase that causes the most tension and conflicts. The population density usually drains the stores of any and all relevent resources and of course everyone feels more entitled over the next guy, mix that with anxiety, frustration and confusion and blammo, you