We are eternal Beings, and at some level we know this. Therefore, the eternal future is a subject of compelling concern - albeit that concern may well be expressed by an absolute refusal to think or speak about it.
I am suspicious of the common modern 'belief in' (which I interpret as desire-for) death as annihilation. I mean, the standard mainstream belief that biological death of the body also entails a complete destruction of every-thing about that person... There is no 'soul' or 'spirit' separable from the body... Dead means dead and gone.
As I mentioned, I interpret this belief as a desire; and my understanding of this desire is that it often arises in those who will not repent (perhaps they will not acknowledge the reality of sin?)... People who are deeply and ineradicably ashamed - and who want (more than anything) for their shame to end.
In sum: those who desire annihilation want permanent annihilation of their own self as a final solution to unendurable existence in a reality with No Hope.
'Death as annihilation' is a manifestation of existential despair.
In the ancient past - at least among both the Hebrews (Sheol) and the Classical Greeks (Hades) - there was a belief in "death" as becoming witless, demented ghosts; spirits with no memory of life and who had lost self-identity.
This was not a torment, nor a pleasant state; rather it was neutral - and implicitly a situation of waiting. The fate of the dead soul was undecided, and there was a possibility of being-rescued.
And this, indeed, happened; since Jesus rescued as many of these souls as wanted to Follow Him.
The anticipation of Sheol/ Hades was therefore for a state after death with hope of escape. But it seems a distinctively modern thing to desire death to be irrevocable; death to be a permanent and complete annihilation.
The modern idea of death is the desire to make an eternal commitment of negation. And, once thus conceptualised, I think that modern death can be seen as a mirror of Christian hope for Heaven.
The Christian believes that he can make an eternal commitment in favour of God; and can thereby join-with God (and others who have made this positive commitment) in the continuing work of loving creation.
In contrast; the mainstream, modern idea of death as annihilation is the opposite desire; the wish to make an eternal commitment to reject God, love and creation.
...And is, thereby, a decision to join-with the side of Satan and the powers of darkness; working against God.
In sum, the normal, mainstream, modern desire for death as annihilation is evil: it is a manifestation of the unrepented sin of despair: it expresses an active rejection of God, love and God's creation.
Note: A somewhat less 'final' version of the death-as-annihilation desire is the wish for death as a state of 'sleep', 'rest', 'peace' and so on - which seems to have become popular in England in the 19th century; and is still expressed in the unthinking repetition of 'RIP'.
This seems to express a desire for death-as-annihilation; but of a potentially revocable type; allowing at least the possibility of awakening after a period of sufficient rest/ sleep/ peace.
Further note: I have not discussed the matter of reincarnation, in its many and contrasting forms; nor what desires they reflect - because I am not yet clear on that matter.