There’s nothing different or more special about one person’s progeny than another
How do you figure that? Are you familiar with the theory of evolution? How do you think we got to the point where I’m communicating to you through a global communication network? Dumb luck?
We are as important to future generations as past generations are to us. If previous human beings hadn’t done everything they did, we wouldn’t be here now. Likewise, everything that we do in the present has a rippling effect for the rest of human history. Having kids allows you to have a little more direct input on what kind of ripples you leave behind.