Government has regulated morality in this country for the better part of 230 years. Only the Supreme Court has barred legislative bodies from regulating morality. And we still regulate morality: see drug laws, murder laws, etc. It's only the morals social liberals don't like (e.g. regulation against sodomy) that have been barred from the public square.
Done a great job of it too. [ /SARCASM ]
Drug laws are pure morality regulation, but laws against murder and theft are the purview of the government because they are protecting personal rights and property rights (the only regulation the govt should be involved in, IMO).