Nobody has yet claimed responsibility for the coördinated attacks, but the Taliban has opposed polio vaccination vigorously. Taliban leaders have issued several religious edicts saying that the U.S. runs a spy network under the guise of a vaccine program. Now, there is no question that this is a depraved, heartless, and sickening act. But, as I wrote in a post here more than a year ago, the claim about the C.I.A. is not entirely untrue.