More guns do have a correlation with less crime... but I'm not 100% sure it could be pointed to as direct causation. Crime being a very complex thing in of itself, I suspect the sort of rational in the areas with lawmakers who pass CC and OC type laws, also tend to promote the types of agendas and laws that lead to lower crime. More good guys with guns are part of the equation, but I don't think it's the only part.
My .02 cent for what they are worth
