The first study to find a significant relationship between firearm crime and subsequent applications for, and issuance of, concealed-carry gun permits has been published in the Journal of Interpersonal Violence.
Seems like which came first, chicken or egg; does increasing violent crime rate induce increase in ccw, or does ccw induce rising violent crime rates. The study indicates the former, that an increase in the violent crime rate causes an increase in ccw permits.
Also, seems this would tend to hold true for pro gun states, but not as much for the more liberal states such as in new England. On the premise that living in a redder state would indicate people tend pro gun, & armed fantasies therewith.
The research focuses on county-level data from all 67 counties in Florida, which has issued more concealed-carry permits than any other state. As of November 2015, there were 1.6 million valid concealed-carry permits in Florida.
The study measures violent crime using the Uniform Crime Reporting index offenses of violent crime, including homicide, rape, robbery and aggravated assault. The two time periods examined by the study are 2005 to 2012 and 1996 to 2012.
Well, case in point, study does not include 1987 - 1995. Florida enabled shall issue in 1987, and violent crime rate increased ~17% over the next 5 years. Begging the question whether its precipitate shall issue helped at all.
Reminds me of the old time con artist salesmen circa 1900's who sold snake oil to 'cure all that ails ye', and gullible people bought it, turned out to be largely quackery mixed in with some diluted flavored whiskey.
Obtaining a concealed carry permit in hopes of immunizing oneself from increasing violent crime, just another bottle of snake oil, peddled by nra quacks.