For any unique event, there will always be elements that one cannot explain, since they occur without precedent. But one must always recognize the difference between knowing that something is true, knowing that something is not true, and not knowing one way or another. It’s the not knowing part that leaves singular events susceptible to inventive accounts (especially from conspiracy theorists) of what may have happened. And, of course, conspiracy theorists know the answers before they investigate, which contaminates their analysis—seducing them to accept what supports their thesis and reject
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