One of the things that always surprises me, regardless of how well my background prepares me to predict the occurance of such things, is just how frequently otherwise logical laws end up being given the same immutable elements one sees in religious dogma. If the law is good and just (like for example, those related to murder), by all means let them have such a status, but if the law is one which is temporally relevant as opposed to being derived from universal truth, such as laws related to culturally sensitive issues, there is both tremendous risk and tremendous benefit.
I don't envy the difficult job the SC Judges have in making those risk/benefit evaluations for the interpretation of the laws, simply because history does not have 'sides' - only the truth.