Are you arguing for eugenics, transhumanism or both?
If I understand you correctly (and I'm not sure I do), you believe that prey animals only don't kill/expell the weak because doing so would attract predators to them and that if we all were genetically superior, we would be "able to" do that and that governments/religion undermines that by giving power to the (presumably inferior) majority and suppress a (presumably superior) underclass and that is stunting our development somehow (presumably only more recently given the massive scientific progress in the past century, so the societal decline would have to have become noticeable only in the recent decades or so)?
I'm trying to steelman your argument as best I can but I'm not even sure I read all of that correctly. If that is what you mean, you're using a lot of words to say "postmodern degeneracy is holding the human race back and we should kill the weak instead of comforting them".