DOMA was enacted to prevent federal benefits like SS, Medicare, federal survivor benefits, and other benefits to same sex marriages. It kept the federal definition of marriage to between a man and a woman.
DOMA instructs all federal officials, and indeed all persons with whom same-sex couples interact, including their own children, that their marriage is less worthy than the marriages of others.
In my opinion, that is the heart of the ruling, and not that some particular state does it differently and is ignored.
Not is their marriage less worthy. Their marriage is NOT marriage.
This is a social engineering decision and not a states rights decision.
Scalia nails it:
However, even setting aside traditional moral disapproval of same-sex marriage (or indeed same-sex sex),there are many perfectly validindeed, downright boringjustifying rationales for this legislation. Their existence ought to be the end of this case. For they give the lie to the Courts conclusion that only those with hateful hearts could have voted aye on this Act. And more importantly, they serve to make the contents of the legislators hearts quite irrelevant: It is a familiar principle of constitutional law that this Court will not strike down an otherwise constitutional statute on the basis of an alleged illicit legislative motive. United States v. OBrien, 391 U. S. 367, 383 (1968). Or at least it was a familiar principle. By holding to the contrary, the majority has declaredopen season on any law that (in the opinion of the laws opponents and any panel of like-minded federal judges) can be characterized as mean-spirited. The majority concludes that the only motive for this Actwas the bare . . . desire to harm a politically unpopular group. Ante, at 20. Bear in mind that the object ofthis condemnation is not the legislature of some once-Confederate Southern state (familiar objects of the Courts scorn, see, e.g., Edwards v. Aguillard, 482 U. S. 578 (1987)), but our respected coordinate branches, the Congress and Presidency of the United States. Laying such acharge against them should require the most extraordinary evidence, and I would have thought that every attempt would be made to indulge a more anodyne explanation for the statute. The majority does the oppositeaffirmatively concealing from the reader the arguments that exist in justification. It makes only a passing mention of the arguments put forward by the Acts defenders, and does not even trouble to paraphrase or describe them. See ante, at 21. I imagine that this is because it is harder to maintain the illusion of the Acts supporters as unhinged members of a wild-eyed lynch mob whenlators hearts quite irrelevant: It is a familiar principle ofconstitutional law that this Court will not strike down an otherwise constitutional statute on the basis of an allegedillicit legislative motive. United States v. OBrien, 391 U. S. 367, 383 (1968). Or at least it was a familiar principle. By holding to the contrary, the majority has declaredopen season on any law that (in the opinion of the laws opponents and any panel of like-minded federal judges) can be characterized as mean-spirited.