The ongoing debate over abortion serves as a clear indication that the Supreme Court decision of 1973 did little to settle the question of abortion's legitimacy. If anything, in fact, the debate has grown, with more strident voices and, in some cases, more violent dimensions than ever before. On both sides, the debate has been dominated by passionate but not always rational arguments. It seems as thought there are no tame opinions about abortion in this country, that public policy is the product of slogans, sound bites, and placards, instead of principled argument. By presenting the balanced,...