I think sometimes the distinction is made between natural and artificial (human made) as a way to sway an argument. In many of these cases, the reasoning is tenuous if we examine with an understanding that the difference is sometimes arbitrary.

If anything, we should be more careful with our use of language. For instance; 'naturally ocurring' vs. 'human made'.

A similar one is synthetic. We've used that label for things like synthetic oil, but there are a lot of other things that are synthesized because it is too difficult to get the material naturally.