Alan Simpson violated a taboo last week when he likened Social Security to "a milk cow with 310 million tits." But contrary to the dictionary-deprived critics who accused him of sexist vulgarity, the former Wyoming senator's transgression had nothing to do with his use of a perfectly acceptable synonym for teat. Simpson's real sin was "belittling a bedrock program," as the AARP put it -- i.e., showing insufficient reverence for a sacred cow. To Simpson's detractors, it is self-evident that a man who supports entitlement reform has no business serving on, let alone co-chairing, a presidential commission devoted to fiscal...