Having lived in several cities with varying gun laws and demographics, I'm sad to say that I agree with carp killer.
St. Louis, MO - no shall issue CCW, permit to purchase handgun required, ranks in the top 10 for per capita murder rate
Atlanta, GA - shall issue CCW, no permit required for handgun purchase, also ranks in the top 10 for per capital murder rate
Salt Lake City, UT - shall issue CCW, no permit required, ranks very low
Denver, CO - recently acquired shall issue CCW, no permit required, middle of the rate in terms of violent crime
There is a strong correlation between a city's crime rate, and the demographics. That's not to say that a given minority is more prone to criminal behavior; it's that there's a relationship of some sort (remember, correlation does NOT equal causation). It could be the prevalance of single mothers, broken families, drug and alcohol abuse, intergenerational violence, any number of things, but few people are willing to point this out.
Of course, it's easier to blame the guns.