Nice write-up!

One way that I think about morality is as an evolving framework. In The Selfish Gene (which I highly recommend if you haven't read it), Dawkins talks about "evolutionary stable strategies." Essentially, it can be personally beneficial to cheat (I'm using "cheat" to mean anyone who takes shortcuts that may harm others) in an honest society, but a society mostly composed of cheaters will typically fall apart. So there's this natural balance that has, over time, rewarded mostly honest societies.

I think as time goes on and justice systems improve, personal needs are met, and humanity becomes more interdependent, a modern society will have less and less room for cheaters. So there will continue to be a blurring of the line between objective human good and personal good. We become so connected that everyone benefits from selfishness.