When you compare lack of gay marriage on demand to school desegregation, all credibility is lost.
The 14th Amendment was written in the 1860s to protect blacks from slavery and was co-opted by court to confer a right that never existed.
Just like how the 2nd Amendment was written in the 1790's to protect the state's right to a militia and was co-opted by the right to confer a right that never existed*.
When we as a country have something called a living constitution, you are able to adapt the meaning of the words to your time. This is what our founding father's wanted. They wanted us to bend and twist the document. They wanted us to think different from them. They didn't want us to live by the rules of their time.
*(When I say this, I mean Automatic weapons, not handguns, or shotguns.)