Rational Markets?

The general impact of the French riots is, I feel, being ably covered by others here, what I am curious about is how financial markets reach their opinions. According to headlines in many newspapers, the euro is falling aginst the dollar as a result of what is happening in France (or see here). This may or may not be a good reading of why the euro is dropping, but if it was the explanation, I would say it was a far from rational response.
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