Noam Chomsky, critic, linguistic scientist

Chomsky first came to prominence in 1959, with the argument, detailed in a book review (but already present in his first book, published two years earlier), that contrary to the prevailing idea that children learned language by copying and by reinforcement (ie behaviourism), basic grammatical arrangements were already present at birth. The argument revolutionised the study of linguistics; it had fundamental ramifications for anyone studying the mind. It also has interesting, even troubling ramifications for his politics. If we are born with innate structures of linguistic and by extension moral thought, isn't this a kind of determinism that denies political agency? What is the point of arguing for any change at all?