In modern forms Natural Law does not allow for negotiation because the Church has made the secondary precepts into absolute rules.
It is based on very complicated notions and doesn’t ask everyday questions such as 'should hospitals get more money than schools'?
It could be argued that we have gained our natural instincts through evolution, not through God and so we do not need a God-based theory.
We can observe differences between cultures, which rejects the notion of a single natural purpose for all humans.
Natural Law could even be seen as a relativist theory - because the secondary precepts might change as we use our reason differently, perhaps because of the different circumstances we find ourselves in. This could be seen as an advantage or a disadvantage! Indeed, some say that we should not rely on our reason but on teachings from the Bible, the Church or from God's revelation.
Vardy and Grosch in The Puzzle of Ethics said that Aquinas gives too simple a view of human nature. (E.g. is sexuality just about reproduction?)
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