I have started the comparison. Based on 2014 data (admittedly not as up to date as yours), the seven states with the highest gun ownership rate are WY, AK, MT, SD, WV, AR and ID. The average gun homicide rate in those states was 4.24 per 100,000. The seven states with the lowest gun ownership were HI, NJ, MA, RI, CT, NY, and IL. The average gun homicide rate in those states was 3.17 per 100,000. Admittedly this is not a full correlation coefficient calculation, but before I crank in the remaining 36 states and write a program to do those calculations, do you want to save me the trouble and just write out that $50 check to the charity of my choice now? I pick Habitat for Humanity.
What is even more telling though is the gun death rate (as opposed to the homicide rate) which includes accidents and suicides. When that same 7 top and 7 bottom states are averaged, we find 14.98 per 100,000 for the top 7 states and 4.59 per 100,000 for the 7 bottom states in gun ownership. For the top 7 states, the total gun death rate is more that triple the homicide rate. I don’t think we should write off accidents and suicides as unsolveable problems, so the gun death rate is really the more relevant statistic to compare.
But even if we do restrict our attention strictly to gun homicides, we have a case for fewer guns being a good thing.