Dupe voters, this is not a dupe. I wish answers only about teachers, not general members of the public. Please re-open

According to the BBC,

US President Donald Trump has said arming teachers could prevent school shootings like that which left 17 people dead last week in Florida.

A staff member with a gun could end an attack "very quickly", he said.

I doubt that any other country has tried arming teachers, so it would be difficult to say definitively; but is there any analogous evidence to suggest that he might be correct? (The good guy with a gun theory)

[Update] Perhaps we could reopen, given that we now know what happens when there is an armed police presence at a school where a mass shooting takes place? (Although, admittedly, we cannot know if a teacher would have acted otherwise)

[Edit] Not one, but four armed police were present. Oh, yes, they were.

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    I do not see a factual claim here, and I don't see how a "could..." or "would..." can be answered in the way of Skeptics.SE... – DevSolar Feb 22 '18 at 9:14
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    I do not think this is a duplicate. That question is about armed bystanders, this is about armed teachers, which, I think, is a significantly different topic, especially as a teacher is not a bystander, but embedded in the situation and presents unique potential benefits and risks. – rougon Feb 22 '18 at 13:37
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    Sometimes the StackExchange system is a bit... odd. I voted for opinion-based (as no relevant data points can possibly exist), not for duplicate. – DevSolar Feb 22 '18 at 15:21
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    Indeed, not a dupe. armed bystanders happen to just 'be around'. Armed teachers would be present as assigned, and with the protection in their task. (Of course, suggesting to arm teachers instead of addressing the real cause is nonsense, but that's another issue). – user22865 Feb 23 '18 at 8:05

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