It undermines any sense of true human rights, leaves the individual defenseless against unjust laws, and opens the way to different forms of totalitarianism.
This should be easy enough to see for a person open to the truth; but many people's minds have set into superficial ways of thinking, and they will not react unless they have been led on, step by step, to deeper reflection and awareness Law and Morality do not coincide in meaning, though there is - there should be - a necessary interdependence between them.
Some people talk about their personal ethics, others talk about a set of morals and everyone in a society is governed by the same set of laws.
Law governs society as a whole, often dealing with interactions between total strangers.
The purpose of human law is the common good more than the good of individuals (I-II, q. Without law, there is no society, only the jungle, the rule of might "If there is justice, and if law is based on a discernment of what is just, dialogue can begin and benevolence can appear; so we come to what is ours in common. Its effectiveness means that barbarism has been overcome: men have always been civilized this way" . If they are treated as relative and subjective, then they become inapplicable to the social sphere; and hence to the whole area of human law.
Let us look at the definitions of ethics, morals, and law. If the law conflicts with our personal values or a moral system, we have to act – but to do so we need to be able to tell the difference between them.
Ethics is the moral principles that govern a person's behavior or the conducting of an activity. Ethics and morals relate to “right” and “wrong” conduct.
Moral law distinguishes right and wrong in (free) human actions.
It is aimed above all at personal improvement and ultimately at salvation.