It's also what makes a human. Without what parents "try to do" (teach the kids to human), the little people would just be like ferral animals, without language, human context, sense of society, and so on.
That doesn't seem right to me, as we cannot survive childhood without adults. Young humans are ready for life in society long before they are able to survive on their own without support from the society around them.
We have been depending on the continuation of some form of society for likely hundreds of thousands of years, not just for staying civilised but simply for survival.
Nurture vs nature is a wrong way to look at things. Without the human nature, the nurture would not work. Try to raise a member of a different species as a human...
