If Allah wanted to give His creation the chance to choose whether to exist in life or not, then, they had to exist in the first place. How could mankind have a say while being non-existent? It is a matter of existence and non-existence. Actually, man's attachment to life and his fear for it are the greatest evidence on how satisfied he is with such a blessing.
The blessing of life is a test for mankind to distinguish the kind person who is content with his Lord from the mean person who is displeased with Him. So, the wisdom of the Lord of the worlds behind the creation is to extract those who are content with Him to win His Paradise in the Hereafter.
This question shows how the misconception could obliterate the mind's logical thinking when taking control of it, and it is one of the proofs of the Qur’an's miraculousness,
as Allah Almighty said:
{I will turn away from My signs those who are arrogant in the land without any right. Even if they see every sign, they will still not believe in it; if they see the way of guidance, they will not follow it, but if they see the way of misguidance, they will follow it as their way. That is because they have rejected Our signs and were heedless of them.} [40] Surat al-A‘rāf: 146.
It is not appropriate to consider knowing Allah's wisdom from the creation as one of our rights that we should demand, this way, concealing such a wisdom from us does not become an act of oppression.
When Allah grants us the opportunity to live eternally in an everlasting bliss in Paradise, which has what no ear has ever heard, no eye has ever seen, and no human mind has ever imagined, what oppression lies here?
He grants us the free will to decide for ourselves, so we choose it or we choose torment.
Allah informs us of what awaits us and provides us with a crystal clear map of the way to reach such a bliss and avoid the torment.
Allah encourages us in various ways to follow the path to Paradise and warns us repeatedly against following the path to Hellfire.
He informs us of the stories of the dwellers of Paradise and how they succeeded in winning it, and the stories of the dwellers of Hellfire and how they incurred its torment so that we might learn from such stories.
He narrates for us the conversations of the dwellers of Paradise and those of the dwellers of Hellfire that will take place between them to help us understand the lesson well.
Allah gives us ten rewards for the one single good deed, and counts the evil deed as one and tells us so in order to hasten to good deeds.
Allah informs us that if we do something good after committing an evil deed, the former will erase the latter, i.e., we shall win ten rewards and will have our evil deed omitted.
He also tells us that repentance erases what precedes it, so the one who repents of a sin is like the one who is sinless.
Moreover, Allah makes the one who guides to good like the one who does it.
He makes it very easy for us to win rewards, as we can gain great rewards and get rid of our sins effortlessly by asking for His forgiveness, by exalting Him, and by reading the Adhkār (regular supplications).
He grants us ten rewards for every letter that we recite of the Qur’an.
Allah rewards us for the mere intention of doing something good, even if we could not do it, and He does not hold us accountable for the evil intention as long as it is not put into action.
Allah promises to guide us more, grant us success, and make the ways of goodness easy for us if we hasten to goodness.
What oppression lies in this?
As a matter of fact, Allah does not deal with us according to His justice alone; rather, He deals with us according to His mercy, generosity, and benevolence.