It isn’t meant to be persuasive. You didn’t ask me to persuade you, you asked me to give you an example of natural law that takes no recourse in Catholic theology. So I gave you one.
To persuade you would take somebody far smarter than me. I’m only 18. Why do you think I link to other sources? It’s because they explain things far better than I ever could.
I found the arguments very persuasive, but to explain them in an easily digestible way to somebody else? It wold take somebody far smarter than me.
In any case, I gave you what you asked for, an example of natural law philosophy being applied with no recourse to Catholic theology. I didn’t make it up. I got it from Thomistic philosopher Dr. Edward Feser, almost word for word:
edwardfeser.blogspot.com/2010/11/is-it-wrong-to-lie-to-hal.html
(And yes, I believe lying to be wrong in EVERY circumstance; it’s a difficult thing to accept but as somebody who believes in the Thomistic conception of natural law I have to be consistent or else I’d be hypocritical.)