WHY IS A DEATH A TABOO IN WESTERN CULTURE?

Everyone wonders why death is a taboo, and almost nobody knows the answer. The word death is not very pleasant. You avoid talking about this topic.
One of the reasons is the fear of dying, we related directly with our death.
Everyone knows that we will not live forever. We don't know if tomorrow we will make up. Personally I'm not afraid. Another issue is religion and society. The majority of people in our society don't believe in any religion, this makes that they don't believe in anything after death.
To conclude, I think that we have to take a leap forward, and begin to lose our fear.