Not directly related to your Katrina example but reminded me of LA. Korean-American business owners in Compton protected their property by exercising their 2nd amendment rights. A lot of these guys are ex-ROK Servicemen. They don't mess around.
"The police were no where to be found, mobs with bricks, bottles, and pipes were looting and burning stores, especially Korean-owned stores. Some people were beaten then had their businesses destroyed..."
"One resists the invasion of armies; one does not resist the invasion of ideas" Victor Hugo