"2022 study of mass shooting incidents, the Crime Prevention Research Institute found that civilians stopped at least 34.4% of active shooter incidents __ Excluding gun free zones, where civilians would not be lawfully armed, that number increased to 51%. "
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Massive errors in FBI’s Active Shooting Reports regarding cases where civilians stop attacks: Instead of 4.4%, the correct number is at least 34.4%. In 2021, it is at least 49.1%. Excluding gun-free zones, it averaged over 50%.
There are certainly other factors at play, but heavy use of c-sections allows for a larger brain, as brain size has historically been limited by birth canal diameter