On August 2nd, 1996, USA Today published the results from a new comprehensive study on the effect of “shall-issue” concealed carry laws (also known as RTC laws),... The study, conducted by John Lott and David Mustard from the University of Chicago analyzed crime statistics in 3,054 counties from 1977 to 1992. The study made the remarkable claim that, if all states had adopted “shall issue” laws by 1992, 1,500 murders, 4,000 rapes, 11,000 robberies, and 60,000 aggravated assaults would be avoided annually
Allow me the OP's coup d'grace to lott:
Funder of Lott 1996 CCW Study Has Links to the Gun Industry
Research conducted by John Lott, purporting to show that relaxed concealed weapons laws reduce crime has been the subject of severe criticism not just for its methodological shortcomings, but also for its funding source. These questions have focused on the ties to the firearms industry of the funder of Mr. Lott's fellowship, the John M. Olin Foundation.
There are significant links between the John M. Olin Foundation and the Olin Corporation, which owns Winchester Ammunition (the largest producer of ammunition in the U.S. and the manufacturer of the infamous "Black Talon" bullet). Olin Corporation at one time also owned Winchester Firearms, a trade name which it now licenses out. Winchester Ammunition stands to reap financial gain from the increased sale of handgun ammunition generated by the passage of lax concealed weapons laws. https://www.vpc.org/fact_sht/lottlink.htm
Greedy Charlatan, thy name is John Lott.