Death is the first blessing. The end of suffering. Even the one who dies suffering of cancer, doesn’t ‘have’ it anymore. And what about justice? There is no easy/simple way to put it: If you don’t believe in the afterlife, this question will strip you of your faith to live with hope. It is hard to believe, so (for me atleast) what works is math/probablility. 4 scenarios:
1) You believe it exists and it doesn’t. You die hopeful and you are never disappointed since there is no emotion in/after death. (100% win)
2) You don’t believe it exists and it doesn’t. You die depressed and you are never disappointed (50% win)
3) You don’t believe it exists and it does, you lose.(0% win)
4) You believe it exists and it does, you win. (100% win)
“Do they then wait for anything other than that the angels should come to them? or that your Lord should come? or that some of the Signs of your Lord should come?! The day that some of the Signs of your Lord do come, no good will it do to a person to believe then, if he believed not before, nor earned good (by performing deeds of righteousness) through his Faith. Say: “You wait! we (too) are waiting.” [surah Al-an’am:158]