Do you know about 'the idea of the truth'? A fact that people know but cannot confirm. They believe in its existence from the moment they are born till the day they die. Though it doesn't cause any problem in their normal way of living, if once corrected, it might change the entire outlook of one's life.
The idea of truth is a necessary evil for a being to thrive in the world.
What will happen after death? What will happen after the planet dies? Do people get to have another life or do people have lived before they were born? The idea of truth is often a fascinating topic that many dwell but not go too deep into.
One such idea of truth is always 'maybe we will survive this ordeal' or 'even if we die, our next life will be better.' It gives people hope that everything that is going to happen next is going to be better than what they are going through. A crude fantasy that even if true, had more chance of getting a worse life than what they had right now.