I wonder how New Mexico got 6? We have open carry, shall-issue concealed, no state-level gun control, full auto is legal, vehicles are considered "homes" (legally, that is, though many take it literally), so guns in cars are no problem, plus we have preemption that's actually respected and enforced. How else could we do "worse"?
Edit: all I had to do was look. We "pass" on "Gun Manufacturer Accountability": "State law allows cities and local governments to take legal action to hold gun manufacturers accountable if they act irresponsibly in the way they design, market or distribute weapons. Gun manufacturers can be held legally accountable, just like the makers of every other product."
Also interesting: look at the "high profile shootings map". Most of those shootings took place in the northeast and west coast. Might be illuminating to correlate the locations of all those shootings with the score of their respective states; get an average score for a "high profile shooting state" vs. a "no high profile shootings state", or plot "number of high profile shootings vs. score".