Since humans and their culture evolved, there are not many humans that are very much like that.

Humans aren't "naturally" like that - at least only a small subset of memes convinces normal ones of the intellectual truth of the proposition "life has no meaning because/if you merely die at the end".

It is a valley of rationality sickness. If I get money now and there is an apocalypse later - such as perhaps the sun expanding to swallow the Earth (especially if we never colonize other places), or the heat death of the universe - I still consider it all worthwhile. The future in which I get a lot of stuff and then everyone dies in a cataclysm is much preferable to me to the one in which I don't get a lot of stuff and everyone dies in a cataclysm.