i think you’re arguing for the idea of survive/reproduce being the end goal of all living things. i think when talking about humans, especially, this gets a little more complex because of consciousness, life experience, societal pressures, ect. even then, individuals in a population still make careful decisions about reproduction and partners in many species. while there are things like hormones programmed into us through evolution, a lot of ppl still don’t want kids. i hope this makes sense.