Backers of laws that let pretty much all law-abiding people carry concealed guns in public places often argue that these laws will sometimes enable people to stop mass shootings. Opponents sometimes ask: If that's so, what examples can one give of civilians armed with guns stopping such shootings? Sometimes, I hear people asking if even one such example can be found, or saying that they haven't heard of even one such example. This prompted me to post in late 2015 about 10 such incidents that I had found in roughly the preceding 20 years.
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