People comes, people goes (A sad story)

The world is so bad. From the big bang to now , many thing happened. If a person come to the world he have to go but he left the world by giving something to somebody. It's obvious. By any reason if newborn baby face the worst word death. For a certain he gives a person(family) happyness. But after death that happyness become hell for the family.For the family the 2 sec is important than a 100 year. Can any one tell me what will if anyone do not have to die. Is that it will be beneficial or it will be bad.