Why, Indeed
Every second, at least one person dies. And in that same second, at least one person is born. This is according to this person’s post, which may or may not be true. We can’t be bothered to search up the birthrates and deathrates of the entire world since that’s not the focus of this post.
We’d like to redirect your attention to the final portion in the OP’s post. “Why isn’t our population 0?” We don’t know where to begin. We feel that you could come up with a logical explanation as to why the population isn’t zero, but the OP would still have no clue.