The way evolution always discovers reasons is by retroactive endorsement.
I have shown that those who deplore Artificial Intelligence are also those who deplore the evolutionary accounts of human mentality: if human minds are non-miraculous products of evolution, then they are, in the requisite sense, artifacts, and all their powers must have an ultimately mechanical explanation. We are descended from macros and made of macros, and nothing we can do is beyond the power of huge assemblies of macros.
Words have a genealogy and it's easier to trace the evolution of a single word than the evolution of a language.
Wherever there is a design that is highly successful in a broad range of similar environments, it is apt to emerge again and again, independently - the phenomenon known in biology as convergent evolution. I call these designs 'good tricks.'