Thanks for your comment. This is why I write.

I'm interested in your opinion about how not living close to nature has changed the rules

Society has taken over the role that Nature once did. Nature dictates survival of the fittest. Society, which favors altruism, dictates that everyone must survive. Babies that would have died at birth because of genetic defects are now saved and live to reproduce to pass on those defects. Old people who would have died because they abused or simply wore out their bodies are now saved through technological miracles. Drug addicts who overdose are saved. I could go on and on. Again, I'm not advocating here one way or the other. Only answering your question.

I know this smacks of eugenics (which is science, and therefore weighted toward the pathogenic end of the spectrum), and seems Hitlerian (the poster child of psychopathy), but what I've alluded to above gives us another chance to look inside ourselves and see how we are affected by social memes, by ideas and ideas implanted into our heads via culture and media. If it makes you uncomfortable, it is an opportunity to examine why.