[LinXitoW]

I think it's actually a great example of very very important non-pedantry. The entire crux of their argument/issue is dependent on their definition of "chemicals". I would even go so far as to say it's just the nature fallacy in disguise.

With the nature fallacy, the definition (or more like the lack of) of what is natural is the entire crux of it. In both cases (natural and "non-chemical") it's the very non-defined-ness that reveals the problem with it: You cannot create a sensible definition.

For nature, what's the definition that puts "rape" and "artificial insulin" on the morally correct side?

For chemical, what's the definition that puts "fortification with iodine, flouride, or whatevers in flour" and "arsenic" on the right side?