The patina of objectivity is very very thin and always has been. Dred Scott now reads like a horror story.
The reasoning underlying Roe is inchoate. The decision about gay marriage opens a pandora's box of psychological conflicts.The deciding line for First Amendment decisions is exceedingly wavey. We put robes on these folks and put them behind pseudo altars and like to pretend that we should respect their superior wisdom. On the other hand, we do need this sort of civilized control mechanism because the alternative is what is going on in Portland.