Rather than gangbangers and maniacal criminals going on killing sprees, it is cases like Dunnachie’s that drive gun violence. FBI data reveal that about twice as many homicides result from arguments than from felonies, and gang violence is only a small contributor. In a careful study of the relationships between homicide victims and perpetrators, analyzing data from 1981–2010, Michael Siegel and his colleagues reveal that for every 1 percent increase in gun ownership, there is a percent increase in nonstranger homicide. Although stranger homicide does increase slightly as gun ownership rises, the increase is not statistically significant. This indicates that there is no deterrence effect from firearm ownership and that a firearm significantly increases the owner’s chances of killing or being killed by somebody he or she knows.