l will give you two cases, one is secular and the other is Christian.
For Christian morality, it is in the Bible, even if the Bible agrees on some points with natural law theory(murder, rape, theft, ) it doesn’t line with it, as the answer in Bible is that they are immoral because God said so.
For secular morality, natural law theory will not produce the greatest happiness or prosperity for humankind, which should be its main goal. The question here is could natural law make our existence objectively worse if we follow them. Aquinas and Aristotle have a view that objects move towards the purpose. Both have different views on what that purpose is, that view of motion is not as valid in today’s world, as science shows that the end purpose of an object is not set in stone, and is changed through the circumstance of that object. Example, (nature of seed being to grown into a tree in one case, while being food for a bird in another)
it’s good according to the one observing, it’s ‘good’ for a tiger to eat the human, but from the perspective of the human being eaten, that’s a bad thing. Beasts and man are terms that change, oldest human civilizations which may be called today as ‘beastly’ didn’t think themself as beastly.
They thought they were above other animals. Same as we do today.
Intellect changes over time, we went from being borderline apes, to what we are now, our intellect didn’t just explode at once. Another problem with natural law, how could people even follow it if they had no understanding of what so ever. Natural law by its definition couldn’t just start working at one point in human development
l am talking about secondary family roles as, uncle and aunts, although it’s not a scientific fact it’s very possible
l would recommend
There are numerous evolutionary mechanisms that might explain homosexual behaviour, which is common in many species of animals
www.newscientist.com
If climate change is real and as problematic as scientists say, would it be moral not to have children for the benefit of society?