One of the main ways that purposive evil has created the prevalent mood of nihilistic despair is by subversion of metaphysics - this has been especially important in destroying the morale of the ruling elite - and creating the mainstream self-hating suicidal animus of public discourse for most of the past century.
Maybe the key metaphysical subversion was to create doubt in the reality and significance of the self ('consciousness', self-awareness, the ego, or 'I') - I mean that ultimate 'me' which comes underneath and before anything else I experience: that which I find when I dig-down as deep within my-self as possible.
It has seemed obvious to almost everybody (adult or child) who has ever introspected, that the self is a reality, and that it has agency: the ability to choose, to evaluate, to motivate. The self is a cause - or so it seems to intuition.
Furthermore, this self is vital to most religions - certainly it is vital to Christianity; because without a self to choose Christ as Lord and Saviour, then there is no possibility of, or meaning to, Christianity,
However, this metaphysical basis has pretty much been overthrown in mainstream modern intellectual culture - and certainly in public discourse.
The way that discourse is structured, there is no space for genuine autonomous choice, no place for the self to reside - merely an arbitrary and subjective 'belief' and an explanation for observed behaviour.
Now it is vital to recognise from the start that metaphysics is the structure of reality as we understand it; and because it is the structuring principle of reality, then it cannot be proven or disproven.
Therefore, experience has no relevance to evaluating the truth of a metaphysical system, evidence from history or science has no relevance to the validity of metaphysics.
So, since the self is a metaphysical assumption; there is no evidence for the reality of the self - and there never can be evidence for its reality.
Neither can there be evidence against its reality; no actual or possible discovery of philosophy, history or science could possibly count as evidence against the reality and autonomy of the self.
But the idea is general that 'modern science has proven' that the self does not exist, or is not a necessary hypothesis. Or something.
Modern people try to function on the basis that at the core of their being is... nothing. There is no core, the self is a 'projection' of higher systems.
So when a man looks deep within himself, and he finds his-self; then this is stated to be an illusion.
The proof? Because... science.
What does this do to a man? To be told that his perception of primary inner reality is some kind of mistake. The idea that at his core is... nothing?
Well, it does things like confuse, bewilder, stun, paralyse, despair. It injects distrust into the deepest level of thinking. It renders thought helpless, unable to gain traction, unable even to begin to understand the world.
Given that there is no reason at all to doubt the reality of the self/ consciousness/ ego/ 'I' - then why would anybody want to do this to himself, and to his fellow men? Why would such a pernicious metaphysical notion be propagated, become mainstream? What could be the motivation for inducing confusion, bewilderment, paralysis, despair?
The answer is - delight in destruction of the Good and the possibility of Good; in other words evil.
The evil of subversive metaphysics is not a small thing; it is not a game; it is not an amusing way of passing the time; it is not a contribution to the intellectual environment: it is a very real, very pernicious evil - akin to gratuitous torture.
To act sinfully is bad, but may be inevitable; to deliberately choose to plan to induce others to act sinfully is much worse than doing the sin. The hands may be clean, but the heart is filthy.
To despair is a sin; but deliberately to induce despair is worse. Those millions of intellectuals - philosophers, scientists, doctors, novelists, dramatists, movie-makers, journalists etc - who have engaged in strategically-subverting the self, should forget about making excuses and repent what they have done.