Is social morality objective and enforceable by government?

Are "right" and "wrong" and "good" and "bad" enforceable objective standards or subjective preferences? If they are objective, what is the most effective means of social enforcement? If they are subjective, should we then encourage unrestrained personal freedom, with only personal responsibility as a self-limiter? Is that possible -- or do we need caretaking by a (hopefully) benevolent government?