Rousseau believed that children are pure in heart and mind and would always behave in morally appropriate ways if not for the corrupting influences of society. this view is more in line with theoretical approaches.

Nativist.

Explanation:

Nativist theory is the biological based theory that argues on how human are pre- programmed and develops the innate ability to develop the human language. Nativist theory mainly focus on the innate language.

The behavioral aspect of the children are in contradicton with the nativist theory. This theory believes that children develop pure heart  and shows moral appropriate. These ways are developed in child from the birth and these abilities help them to work towards mastering a language.

Thus, the answer is nativist.