what does law have to do with morality? We don't legislate based on morality. The two are separate, and right now we're talking about morality, not law, so I cannot see your point.
I think you are wrong. Legislation is based on well-being and morality. Laws governing sexual conduct is an example. Laws that protect the well being of animals is another example.
A person that drinks, eats, parties and is a slob, etc, as debauchery is defined is not harming anyone. But is he moral? If not, because you say so when if he is viewed as such by society?
Suppose you disagree with society about what conduct is moral? Does morality exist?
Murder, rape, and theft are punishable crimes in every society on the face of the earth and legislation is based upon the protection of the well-being of everyone and on morality.
I haven't seen solid proof of morality.