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In a better world — specifically, a world with a better policy elite — a good jobs report would be cause for unalloyed celebration. In the world we actually inhabit, however, every silver lining comes with a cloud. Friday’s report was, in fact, much better than expected, and has made many people, myself included, more optimistic. But there’s a real danger that this optimism will be self-defeating, because it will encourage and empower the purge-and-liquidate crowd.