Okay, trying to get this thread back on track...
Some people were dissatisfied with Mississippi as a single indication of whether or not guns prevent crime. So here's what I did:
I got a list of the states that had unrestricted gun possession, shall-issue permit states, and gun restricted states from keepandbeararms.com. I got their crime data for 2003 from the FBI Uniform Crime Reports. I took the different categories, state by state, and took the population and the rate of violent crimes per 100,000 population. I made a weighted average, an average of the violent crime rate weighted by population. Here's what I came up with:
States that restrict the carrying of guns (CA, DE, HI, IA, MA, MD, NJ, NY, RI, IL, KS, NE, WI): Total population 103,939,261; violent crime rate 494.2 (4% above the national average of 475).
Shall-issue permit states (all of the rest except AK and VT): Total population 181,167,608; violent crime rate 459.2 (3% below the national average).
Unrestricted gun carry states (AK and VT): Total population 1,267,925; violent crime rate 357.5 (25% below the national average).
Seems like a clear trend to me!