There are at least two schools of ethics. One school, (the morality one) accepts that there are certain things that we all understand are against the moral rules and if allowed by society to occur, will eventually ruin society. (These rules can come from scripture, or common sense, but people who believe in them believe they are apriori valid.
The other school, (the secular one) believes that morallity is subject to community standards and can be changed by a community if they so desire. In this way, some Mormans may support a small community of bigamists. The two schools of morality can sometimes both exist as long as there is some separation between them.
But the world is getting smaller and it is harder to argue that what happens someplace does not lead to affects in other places. So which morality do we accept? It looks like the USA is leaning a little towards the fundamental idea of morality. This is good in my opinion. Situational morality has always seemed to be nice in principal, but flawed in usage wherever it is tried.
Additionally there is moral culture which is changing on a daily basis in our country, in the future there will be no Christmas, because Christmas offends certain ethnic groups. Preserving the culture of the United States is a moral priority. Live in the United States and take its economic advantages one should adopt the culture and language.