Often lost in the gun violence discussion is the fact that - every year - suicides make up appoximately 2/3's of the total gun deaths. While it's argued that this is a "mental health issue" and therefore has nothing to do with guns, what we know about the impulsive nature of suicide - coupled with research that says that most who attempt suicide with a method other than a gun and live do not try again - indicates otherwise.
Easy access to guns surely plays a role - as "the nine states (in America) that rank lowest in terms of gun prevalence are the very same nine that rank lowest for suicide rates. Similarly, the three states top-ranked for gun prevalence can be found among the four states ranking highest for suicide rates". (Source)