Adaptability is not human nature, it is a trait of all living beings. Human nature is hierarchical because humans are social beings, i.e. tending to organize into hierarchical societies. And yes, it is programmed into us before we are born... 
Adaptability = trait of all living beings. Humans = living beings => Human beings have the trait of adaptability. Right? As much as dislike Aristotelian either/or logic, I think his syllogism works within that framework.
I think it is evident from my post that adaptability is not something specific to humans only but inherent in all living beings. It is not a trait of human nature which distinguishes it from other creatures (the context was about what makes human nature so peculiar), that's all
In short, you'd better stop nitpicking
