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Hmmm, interesting question. How is that any different from betting against a currency because there's some other manmade disaster looming? Unless you KNOW FOR CERTAIN, then that's a different question. But if your BET is as good as any others (ie, no knowledge of certainty of event), no ethical issue there.
People play the market based on contingencies all the time. The ethical issue only arises if people CREATE the event hoping to bank on it.
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