It's just that we are probably born during a period in history that so far, really doesn't matter. Humans don't live long enough to matter, and most of us don't see past our own day, much less how we leave the rest of humanity in say, 672,283.5 years from now.
At some point someone may develop and publish a theory for traveling faster than light, later on someone else may build an actual ship that can do that. And eventually someday humans might meet a race that isn't hostile, and has also travelled the universe seeking out other life forms. And the first time in history, likely hundreds of thousands of years from now, they will meet and actually be able to communicate and the other beings will say "what did we do all of this for, if we are all going to die anyway, and btw, you people are morons".
And after that, as the universe begins to die out, and all of the available fuel for the stars is spent, and the universe is a cold, vast, black, lifeless place 100 trillion years from now, the only thing left will be an unopened package of Hydrox cookies from a distant dead planet orbiting a distant dead star, floating forever in the vast void, still okay to eat despite being past the freshness date.