I am just unfamiliar with what Thomas aquinas had to say about natural law. I am, however, very familiar with what Plato and Aristotle and John Locke and Rousseou and Hobbes, Calvin, had to say.
The thing is, we humans have conversations. Throughout the ages. No single human holds a monopoly on truth. This is why we discuss different ideas.
It is also important to be respectful to each other.