No Backlash, Mr. Chief Justice

For those who believe homosexual conduct is sinful and marriage is a sacrament limited to one man and one woman, the potential damage posed by an expanded definition of marriage is much harder -- indeed, essentially impossible -- to articulate.

The challenge leaves lawyers defending marriage bans stammering about the derivative harm that would somehow befall children in traditional marriages if the link between marriage and procreation were severed.

"There's harm if you change the definition because, in people's minds, if marriage and creating children don't have anything to do with each other, then what do you expect? You expect more children outside of marriage," John Bursch, defending Michigan's marriage law, told the justices.

Right, there's going to be less straight marriage and more out-of-wedlock births, if gays and lesbians are allowed to marry, and have the children they're already having, under the auspices of marriage. How much simpler to brandish a sonogram of a developing fetus.

Another reason to doubt the coming backlash can be found in the polls. The trend line on abortion is essentially flat over the last four decades. In 1975, 19 percent of those surveyed by Gallup believed abortion should be illegal under all circumstances -- the same number as in 2015.

Meanwhile, the generational differences are muted. According to the Pew Research Center, 57 percent of adults under age 30 say abortion should be legal in all or most cases, the same as among those in their 30s and 40s, and just a shade higher than the 55 percent of those in their 50s and early 60s.

On marriage, the public transformation has been rapid, and the generational divide cavernous. In 1996, 68 percent told Gallup they were opposed to recognizing marriages between same-sex couples. By May of this year, that share had fallen to 37 percent.

In generational terms, Pew found 73 percent support for same-sex marriage among millennials, born after 1980, 59 percent support among Gen Xers (1965-1980); by contrast, just 39 percent of the oldest cohort backed gay marriage, although that was nearly double the share in 2001. In short, opposition to same-sex marriage is, literally, dying out; opposition to abortion is persisting.

To riff on the chief justice: If you are among the many Americans disappointed in the marriage ruling, by all means, bemoan it.

But do not bemoan the coming public backlash. That part's not going to happen.

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Ruth Marcus' email address is ruthmarcus@washpost.com.