There is no questioning the good that transparency creates in a wide range of contexts, government especially. But we should also recognize that the collateral consequence of that good need not itself be good. And if that collateral bad is busy certifying to the American public what it thinks it already knows, we should think carefully about how to avoid it. Sunlight may well be a great disinfectant. But as anyone who has ever waded through a swamp knows, it has other effects as well.