@OntheWindowStand,
The funny thing about putting moral mores into law is that you solidify those social mores from changing. At least in the law. In reality, the people's morality continues to change as it always has, and the law would become increasingly out of tune with the expectations and morals of society--an awkward situation, considering the insane difficulty of getting a law changed, much less revoked.
Should the law then, legislate morality? The simple answer is no. In a diverse country like the United States, there is practically no issue on which a moral consensus can be reached. To enact moral legislation then would violate minority rights/civil liberties.
But then what about murder and theft? Grand theft auto, extortion, blackmail, slavery? In the case of murder, a very real observable threat to societal stability is documented. Same goes for theft, extortion, and blackmail. In fact, almost all the major laws that we all pretty much agree to be just are secularily valid and viable(slavery being the noted exception).
And that makes sense, because we don't need to consult morality
per se to figure out what laws to make. We just need to uphold the stability of society, which, in my opinion, is all that is absolutely required from the law.