Most of these rule were done away with during the Reagan/Thatcher era, when it was decided they were just too expensive, and needed to be replaced with the worship of the bottom line and associated pragmatism.
"Greed is Good" the mantra of the 1980s, Decadence became a virtue, Charity became a dirty word, pity and compassion became signs of weakness. Empathy became a tool to spot weakness and exploit it,
"Do unto others as you would have done unto you", shifted to "Do over others before they do over you"
two generations on we have leaders like Boris and Trump, liberal is a dirty word, and a conservatism a synonym for Nazi-lite.
This is the point in history where "We and Our" give way to "MINE" and every empire, civilization and golden age has given way to war, conquest, chaos and and the fall of reason in favour of "might makes right"
Only in the past those players did not have world ending WMDs

Given the near absence of religious underpinning, this must have been the last gasp from the Enlightenment.

Sadly all of today's politicians the world round were not taught such standards & ethics. Furthermore many of the "rules" are designed to keep the students & when adult subservient to the notion of national superiority. In the case of USA that has sadly resulted in the arrogant attitude\ belief that the world outside of USA is there for Americans to bully, plunder, rob & subvert solely for American benefit. It is now being realised that very few Americans are included in the benefitting class.

It has been a long time since they stopped teaching ethics and morals in schools. I wish it would come back.

Sounds great, except for lynchings and segregation and keeping women as chattel......