Why do people want to have children?

Is it purely because of scientific reasons? Naturally we were made to in the end reproduce. I mean really what other reason?

But people are much more aware than any other animal and in terms of survival there is plenty of humans.

I ask for the people that have children or want to, why exactly did you come to that decision?

Why is it so important that you must have a child?

I will not include adopting in this question.