I would argue the theory of original intent. I think the situation in NO is exactly what the framers of the Bill of Rights had in mind.

Private-law-abiding citizens using their legally owned fire-arms to protect their property and livelihood.

mi·li·tia ( P ) Pronunciation Key (m-lsh)
n.

1. An army composed of ordinary citizens rather than professional soldiers.

2. A military force that is not part of a regular army and is subject to call for service in an emergency.

3. The whole body of physically fit civilians eligible by law for military service. (from dictionary.com)