Do Civilians Armed With Guns Ever Capture, Kill, or Otherwise Stop Mass Shooters?

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” 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 even one such example. Naturally, such examples will be rare, partly because mass shootings are rare, partly because many mass shootings happen in supposedly “gun-free” zones (such as schools, universities, or private property posted with a no-guns sign) in which gun carrying isn’t allowed, and partly for other reasons.”