Now this is speculation on my part, but I assume that any organisms that didn't have this innate drive randomly present in their biology, they died off, so all that's left now are the organisms with this drive.
So organisms that didn't seek out reproduction at our earliest form of life, are dead and what remains are the organisms that randomly developed with this drive.
My boss loves asking me why I haven't done something he asked me to do a month ago, only for me to tell him I did it a month ago and it's in review for him to finalize 🥲