One has children in the expectation of dying before them. In fact, you want to make damn sure you die before them, just as you plant a tree or build a house knowing, hoping that it will outlive you. Thats how the human species has done as well as it has.
We didnt build the interstate system to connect New York to Los Angeles because the West Coast was a priority. No, we webbed the highways so people can go to multiple places and invent ways of doing things not thought of by the persons building the roads.