Question

With regard to language learning, nativists (such as steven pinker in the video born to talk) believe that

Answer 1

they believe that human beings  have an inborn capacity for learning language.
According to them, humans are programmed to be able to communicate with other human beings as a self-defense mechanism.
The way we commnicate between humans don't necessarily need to be the same between each region, but it always needed in order to strenghten our probability to survive in the environment.