Looks like we have some data on concealed carry permits and gun violence. The data is very detailed. Here is an example...
Circumstances: On January 8, 2008, concealed handgun permit holder Joshua Noel
Jones, 22, shot and killed 15-year-old Daniel Wayne “Danny” McKinnon. According to
news reports, the two were traveling in a Chevrolet Z71 pick-up truck with two other
friends—Alicia Algier, 23, and Justin Whiddon—after having visited a Wal-Mart and
getting breakfast at a Waffle House restaurant. According to news reports, the three
males were apparently “dry-firing” (pulling a gun’s trigger presumably without a bullet in
the chamber) handguns at one another in the truck when Jones shot McKinnon with his
40 caliber handgun. When Algier was asked why she didn’t do anything to stop the
males from dry-firing their guns, she stated, “It concerned me. They’re guys, I been told
they do it all the time, dry firing their guns.” Whiddon also dry-fired a .22
handgun—owned by Algier—at Jones. In court, Algier stated, “I keep it for safety
because I’m a woman.” Police retrieved three handguns and four rifles from the truck
after the shooting. After allegedly shooting McKinnon, Jones did not give police an
official statement, instead asking for an attorney. According to police he did, however,
state that the handgun went off accidentally. Jones was charged with manslaughter and
was convicted and sentenced to 12 years in prison.
Responsible gun owners rejoice at "dry firing."