I feel dumber for having read that last line.

JUSTICE KAGAN: Well, could you explain that a little bit to me, just because I did not pick this up in your briefs.
What harm you see happening and when and how and — what — what harm to the institution of marriage or to opposite-sex couples, how does this cause and effect work?
MR. COOPER: Once again, I — I would reiterate that we don’t believe that’s the correct legal question before the Court, and that the correct question is whether or not redefining marriage to include same-sex couples would advance the interests of marriage as a -­
JUSTICE KENNEDY: Well, then are — are you conceding the point that there is no harm or denigration to traditional opposite-sex marriage couples? So you’re conceding that.
MR. COOPER: No, Your Honor, no. I’m not conceding that.
JUSTICE KENNEDY: Well, but, then it — then it seems to me that you should have to address Justice Kagan’s question.
MR. COOPER: Thank you, Justice Kennedy. have two points to make on them. The first one is this: The Plaintiffs’ expert acknowledged that redefining marriage will have real-world consequences, and that it is impossible for anyone to foresee the future accurately enough to know exactly what those real-world consequences would be. And among those real-world consequences, Your Honor, we would suggest are adverse consequences.