Welcome to the Constitution.
As to the process of getting judges to declare who can and cannot be married, the greatest damage that has been done to the fabric of this nation has been accomplished by judges. The solons who handed down the Dredd Scott decision all but started the Civil War. And the judges who handed down the Roe v. Wade decision started the culture wars.
If I were a libertarian, I would think thrice before going to the Supreme Court to accomplish cultural objectives which have been lost in the Court of Public Opinion.
Of course, I understand that the Constitution establishes the procedural framework for who should make these sorts of decisions, and how. All I was saying is that libertarianism, as a governing philosophy, generally has more to say about what government should and should not do, than it does about the process of how government should make decisions.