Arrogance called out in SCOTUS dissents vs. Christians

Something occurred to me regarding my last post: Some of the Supreme Court justices on the losing side of gay marriage accused their fellow justices of arrogance much like I did with liberal Christians. They accused them of having special insight that no one had had for thousands of years prior, much the same as I did with liberal Christians. I disagreed with those in the dissent for committing an argument from tradition. Yet, I still think I'm correct in calling out Christian arrogance. Here's the difference: With Christians, they are claiming that wisdom was bestowed upon some humans by Jesus nearly 2000 years ago, but it is only just now that humans are figuring out that wisdom. In the other case, there is no such claim; it is a case of humans figuring out their own wisdom, which is a process that takes time. Plus, we can see the gains in wisdom over the course of time, whether it be creating a democracy in an age dominated by monarchies, ending slavery, allowing non-landowners and eventually women to vote, etc. There's no special insight here. It is, as Martin Luther King, Jr. described it, the long moral arc of the universe bending toward justice.