Some of us are concerned with the metanarratives underlying society, but and given society is apt to have many competing metanarratives. Logical Positivists tapped into the narrative of science, which is a primary theme of Enlightenment thinking. This was supposed to have supplanted the narrative of superstition, except it didn’t. And a sort of empirical, scientific Nature was supposed to have supplanted the metaphysical gods, except it didn’t.
Apart from the problem that a supernatural God was replaced with a sort of animated Nature, some people just didn’t buy into the new narrative. Today, in the 21st Century Western world, some people still subscribe to these pre-Enlightenment notions, but that’s not the root of the issue. Neither is necessarily right or wrong. And in a Hegelian synthesis, some people assuage the ensuing cognitive dissonance by merging the two and cherry-picking the ones that work for them. These people usually have little difficulty finding people who believe that the earth is 4.5 billion or 6 thousand years old, that Ayurvedic medicine is superior or inferior to Allopathic medicine, that vaccines cause or don’t cause autism, that homeopathy is effective or ineffective, that the Illuminati are some secret society that rules the world or not.
Many people still can’t get past an appeal to nature, whence the Organic and traditional medicine movements. This is not to say that some or all of these claims might have validity; it’s just to say that ‘because it’s natural’ is not a suitable defence. Even a stopped clock is right twice a day—unless it’s set to a 24-hour display, in which case it’s only right once a day.
Without rehashing the argument whole hog, we know that poison ivy and uranium, arsenic, and cyanide are all natural. Not many attempt to defend this with an appeal to nature, so this suffers from selection bias from the start.
you cannot go against nature
because if you do
go against nature
it's part of nature, too
— Love and Rockets, No New Tale to Tell
The larger issue is about how we define nature. I don’t recall if this was Lyotard or Lacan (and I don’t feel like looking for the cross-reference at the moment), but by definition everything observed is natural, whether physical or behaviour.
Some humans—notably the Enlightened ones—like to view themselves as somehow above nature, but the veneer is nanometers thin and threadbare at that. And these people extend this concept to behaviour. As the song goes, you can’t go against nature because when you do, when you observe it, it is by definition part of nature, too.
Oftentimes, this becomes a moral argument: this or that is unnatural. Certain sexual activities are usually held up as examples, and yet many of these activities are not only practised by many humans, they are also practised by members of other species. The argument is that we need to elevate about nature, an so they are making some appeal to meta-nature or some such.
In any case, the complaint shouldn’t be whether it’s natural anyway. It might rather be couched in some instances as not ‘naturally occurring’, so plastics would not happen save for manufacture, but neither would asphalt or telephones or televisions or processed foods, so I find it to be disingenuous to rail against some items that do not occur naturally whilst ignoring the ones you happen to find useful.