Howard Nemerov examines the data, the conclusion of which is that yes, concealed carry supports law enforcement.

In Right-to-Carry states, private citizens have greater freedom to defend themselves in public. Because the ratio of justifiable homicides by police and citizens is more balanced, and because the level of police defensive justifiable homicide is lower, one can only conclude that armed citizens are adept at self-defense, enough to provide a quantifiable level of protection for law enforcement. In non-RTC states, the reduced self-defensive capability of the citizenry correlates with higher rates of violent crime and a more dangerous work environment for police officers.

Read Howard’s article for the data analysis. You can even email him to get the spreadsheet.