Vanadium 50
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berkeman said:I think Moonbear and Vanadium have touched on the key point in all of this.
I don't think I made any point at all. Just answering rootX's question.
Of course "prevent a massacre" is a very high standard. If a gunman gets a few shots off himself before he himself is subdued, the massacre hasn't been prevented. It's effects have been curtailed. If the gunman didn't get any shots off, this will be portrayed by his attorneys as a case where a vigilante crowd overreacted to a mentally ill man brandishing a gun with no intent to fire. (What else would you expect them to say?)
There is also media bias. I'm not talking about a perceived bias of the media towards one or the other pole of the political spectrum, but that the media tends to report - and repeat - stories that are spectacular, extraordinary and dramatic. A gunman who shoots up a school or a shopping mall is makes for a more dramatic story than one where he is subdued by off-duty police before anything happens. So we shouldn't be surprised if a search for well-publicized examples gives us a different answer than a statistical study. (This is why people think air travel is more dangerous than automobile travel - every plane crash is reported. Car crashes are only reported if Britney Spears was driving)