CS Lewis (eg in The Abolition of Man, 1943) and Alasdair MacIntyre (e.g. in After Virtue, 1981) showed clearly that modern 'ethics' is merely emotivism; i.e. it goes no deeper than emotions. As in the phrases "That's just your opinion", or "Everything is relative".
This must be the case for secular-modernity; since when there is no God (and when that God is not Good) then there is only individual human psychology.
What was not so evident to Lewis and MacIntyre as to us in 2021 was that, in practice - and in a bureaucratic-media-dominated global totalitarianism; this means that 'morality' is merely a product of currently-dominant power and propaganda.
In other words; whoever can most effectively and widely manipulate emotions, is able to define today's morality.
And tomorrow's morality will be... whatever power and propaganda say it is.
And that is All there is to modern morality.
In a world where transcendental purpose and meaning are declared and assumed absent; morality is no deeper nor more lasting than the current status of manipulated emotions.