Guns are most often used for self-defense.
a. If you go on the web, you can find surveys that allege the use of guns for self-defense numbering in the millions of episodes per year. However, these surveys are often carried out by biased organizations and are methodologically flawed. They have therefore been demonstrated to be unreliable.
b. More reliable studies, conducted by unbiased sources such as Harvard University, have shown, among other things, that: very few criminals are shot by law-abiding citizens; most criminals are shot either by the police, or by other criminals; and firearms reported to have been used in self-defense are, most of the time, used against members of a family or erstwhile friends during arguments.
Along the same lines, the statement concerning the Colorado theater massacre issued by Luke O’Dell, a spokesman for the Rocky Mountain Gun Owners association, reflected the misconception that the answer to gun violence is more guns: “Potentially, if there had been a law-abiding citizen who had been able to carry [a gun] in the theater [in Colorado], it’s possible that the death toll would have been less.” One might more plausibly argue that if the shooter had not been able to procure a rifle, a shotgun and two handguns “to carry” into the theater, the death toll would have been zero.