The Golden Rule is practically universal. I'm surprised it doesn't get a mention. I'm partial to Hillel's version: "What is hateful to you, do not do to others—this is the whole of Torah; the rest is commentary. Go and study."
https://en.wikipedia.org/wiki/Golden_Rule
> It’s true that Greene is a utilitarian—believing (to oversimplify a bit) that what’s moral is what maximizes overall human happiness.
I prefer this formulation: what's moral is what minimizes overall human suffering, now and in the foreseeable future.
> The rift was mended by putting the boys in non-zero-sum situations—giving them a common peril, such as a disruption in the water supply, that they could best confront together.
It's tragic that Covid19 hasn't united us. How did we end up fighting over wearing masks? (This question is rhetorical.)
> Self-doubt can be the first step to moral improvement.
I mean yeah, but: “One of the painful things about our time is that those who feel certainty are stupid, and those with any imagination and understanding are filled with doubt and indecision.” — Bertrand Russell
This entire essay is premised on people wanting to get better. On having some degree of curiosity and willingness for self-examination. I don't see a lot of that in the world.