We live in a universe where all things decay. There is no known exception. Species go extinct. Stars die. As best we know, the universe itself will die: http://en.wikipedia.org/wiki/Ultimate_fate_of_the_universe
You and I will die as well, and pretending otherwise causes a lot of harm. The best we know how to do now is to extend life a little; but we don't even do that as well as we could because we waste fantastic sums on futile end-of-life care. And that money also doesn't make it to the medical research that could help the next generation, or the one after that.
But I think the harm is deeper than that. Who do you think is more likely to be fully aware of how short life is? The next Einstein now toiling in a lab? Or somebody watching their third hour in a row of reality TV?