J. Budziszewski said this quote
“ Are we really moral monkeys? I don't think so. We only strike the nihilist pose selectively, to put to shame rules we no longer try to keep. When it suits us, we can be quite Puritanical: Right and wrong are in the eye of the beholder, .' The veneer is skeptical, but the core is rigid and punitive. The whole affair looks more like a fence around conduct that cannot bear close examination, than like a serious intellectual position. The whole idea of a moral law is that it binds us whether we like it or not. If it really were just a social convention –< then it wouldn't be morality. >St. Thomas denies that the basic structure of morality is a construct. It is not rooted in human will and power. Rather it is rooted in nature, in structure of creation, in the constitution of the human person – in something we cannot change by human will and power. The good and the right are not things we invent, but things we discover. They are not constructs, but gifts. These gifts are the fount of the law. ”