Why does death matter?

Does death really matter? More people are dead than alive , 2 people die every second its inevitable, unavoidably so why do we spend our lives worrying about it then mourning once people pass away. Of course life is good but if someone dies why should we care in any way other than they can no longer contribute to the world. So Does Death itself matter or is it merely that that a person no longer having a "life" that leads to our grief and fear?