George F. Will: High court heading into unchartered terrority

Published: March 17, 2013
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When on March 26 the Supreme Court hears oral arguments about whether California's ban on same-sex marriages violates the constitutional right to “equal protection of the laws,” these arguments will invoke the intersection of law and social science. The court should tread cautiously, if at all, on this dark and bloody ground.

The Obama administration says California's law expresses “prejudice” that is “impermissible.” But same-sex marriage is a matter about which intelligent people reasonably disagree, partly because so little is known about its consequences.

When a federal judge asked the lawyer defending California's ban what harm same-sex marriage would do to the state's interests in “the procreation purpose” of heterosexual marriage, the lawyer said, “I don't know.” This was mistakenly portrayed as a damaging admission. Both sides should acknowledge that, so far, no one can know.

A brief submitted to the U.S. Supreme Court concerning the California case by conservative professors Leon Kass and Harvey Mansfield and the Institute for Marriage and Public Policy warns that “the social and behavioral sciences have a long history of being shaped and driven by politics and ideology.” And research about, for example, the stability of same-sex marriages or child rearing by same-sex couples is “radically inconclusive” because these are recent phenomena and they provide a small sample from which to conclude that these innovations will be benign.

Unlike the physical sciences, the social sciences can rarely settle questions using “controlled and replicable experiments.” Today “there neither are nor could possibly be any scientifically valid studies from which to predict the effects of a family structure that is so new and so rare.” Hence there can be no “scientific basis for constitutionalizing same-sex marriage.”

The brief does not argue against same-sex marriage as social policy, other than by counseling caution about altering foundational social institutions when guidance from social science is as yet impossible. The brief is a pre-emptive refutation of inappropriate invocations of spurious social science by supporters of same-sex marriage.

For example, a district court cited Dr. Michael Lamb, a specialist in child development, asserting that the “gender of a child's parent is not a factor in a child's adjustment” and that “having both a male and female parent does not increase the likelihood that a child will be well-adjusted.” The conservatives' brief notes that, testifying in the trial court, Lamb “had conceded that his own published research concluded that growing up without fathers had significant negative effects on boys” and that considerable research indicates “that traditional opposite-sex biological parents appear in general to produce better outcomes for their children than other family structures do.”



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