Things that "only stand to reason" often turn out to be wrong. It's called having a theory without evidence but applying it anyway. It can be right, but there's just no guarantee. None. "Natural" things, by some definition, might also be superior to artificial ones in any individual instance. Or might not.
Chance thought: there are certainly plenty of conservatives and libertarians who lean in a whole foods/natural foods direction, but the main appeal for organic/vegan/alternative medicine types is among liberals. Odd that they should prefer lots and lots of human intervention and control by large, distant entities when it comes to an economy, but not when it's food or medicine. I imagine that's related to their dislike and distrust of corporations (because they don't understand how they work) contrasted to their trust and confidence in nonprofits and ahem, Public Servants.
This would bring me back to my Arts & Humanities Tribe discussions pretty quickly.