When did it become unconstitutional to exclude homosexual couples from marriage? 1791? 1868, when the 14th Amendment was adopted?

Why can't the state accede to the public's wishes?

Many Americans do not want persons who openly engage in homosexual conduct as partners in their business, as scoutmasters for their children, as teachers in their children's schools, or as boarders in their home. They view this as protecting themselves and their families from a lifestyle that they believe to be immoral and destructive.

[T]he enshrinement of constitutional rights necessarily takes certain policy choices off the table.... Undoubtedly some think that the Second Amendment is outmoded in a society where our standing army is the pride of our Nation, where well-trained police forces provide personal security, and where gun violence is a serious problem. That is perhaps debatable, but what is not debatable is that it is not the role of this Court to pronounce the Second Amendment extinct.

Certainly the Constitution does not require discrimination on the basis of sex. The only issue is whether it prohibits it. It doesn't.

People look at rights as if they were muscles — the more you exercise them, the better they get.

You could have 50 different states having 50 different regulations... until they were all litigated out.