If human free will is, in effect, an uncaused cause (as it must be, to be free); and if therefore free will is autonomous of God's will; then God cannot by any means force a human soul to enter Heaven - and therefore not all can necessarily be saved - even if (as I believe the Christian God does) God wishes to save all Men.
If the free will of each Man is part if the nature of things, then Man must choose Heaven, must choose to allow himself to be saved by Christ - otherwise Man will not be saved, because Man cannot be saved except with his own consent.
The operations of evil are about inducing Man to refuse to be saved; evil cannot block Heaven, evil cannot coerce choice, and evil cannot change the fact that Man is moral (more exactly, that man knows Good and seeks Good).
But evil works to distort and invert the concept of Good into anti-Goods, such that Man, despite knowing Good (and as a Son of God, each Man intrinsically knows Good), uses his free will to reject Good, and prefer anti-Goods.
An anti-Good is something which is Good-according-to-Man's ideas; Good therefore by denial of natural, spontaneous Good - an anti-Good is perceived as Good according to some new scheme of Good which necessarily entails the distortion, denial or inversion of Good.
Thus the essence of evil is not the specific choice against Good, but the schema (the system - for example the moral system) which redefines an anti-Good choice as Good.
Repentance is the recognition of the schema of Good, against which the choice against Good can be understood.
The failure to repent is to make the choice to adopt an anti-Good schema; such that one redefines Good.
The refusal to repent is therefore to be loyal to one's chosen schema of anti-Good; and failure to repent is the one cause of damnation because it is to make choice of a schema which redefines Heaven as Hell.
Salvation is refused by the unrepentant because - according to one's chosen anti-Good schema - salvation is redefined as evil.
Thus damnation - the refusal of Heaven - is not a consequence of hedonism, but for example may be a moral choice, made according to a personal (chosen) anti-moral schema.
In freely choosing an anti-Good schema - a schema which is not God's Good, but is instead Man's own personal 'Good' - a Man may ultimately choose to reject salvation which was won for him by Christ and is open to him simply on the basis of consent.
The evil of modern times in The West is not a matter of evil specific choices, but that anti-Good schemata are so prevalent.
People have en masse chosen to redefine specific anti-Good choices in terms of a false schema which evaluates them as being Good.
It is this societal choice of schemata which distort and an invert reality, which redefine evil as Good-according-to-the-chosen-false-schema - which imperils salvation on a vast scale in the West.
The triumph of evil is to induce so many Men to choose to refuse salvation on the basis that - according to the evaluations of modern Western schemata - salvation is evil.
Therefore, Heaven is shunned because (by the light of modern Western evaluations) Heaven is perceived as immoral, aesthetically-unappealing, and (anyway) a fake.
The paradox is the immorality, aesthetic revulsion and falsehood of Heaven are defined in terms of a schema which itself denies the reality of morality, beauty and truth.
The triumph of evil in the modern West is to induce Men to choose an anti-Good schema; one this has been achieved, damnation is assured since repentance of specific evils is impossible.
Damnation is assured - unless the false schema, the system of anti-Good, is recognized as anti-Good, and the schema is therefore repented and rejected.
Only after the anti-Good schema is repented will repentance of specific evil choices again become possible.