In his book God and the Philosophers, the Austrian American atheist philosopher Paul Edwards writes:
When we die we do not return to the “bosom of Nature” or the bosom of anything. After death we will have no experiences at all for ever and ever; and this is what is so terrible about death. The fear of death is no doubt instinctive, but it is also entirely rational. The usual consolation that we also did not exist for an infinite period before birth is not really to the point. The non-existence before birth was followed by life, but our present life will not be followed by another life after we die.
Whether the fear of death is rational or not, there is also a more common sense perspective available on this issue. Fear of death seems to be hardwired in human nature, only the intensity of this fear differs among humans. Instead of trying to overcome this fear of death with logical arguments, it would be more productive to seek meaningful rejuvenation and human enhancement therapies that would substantially reduce the probability of death by tackling aging and the fragility of human life.
It is surprising that the work of Paul Edwards has not received more attention by life extension advocates. His book Heidegger and Death and his collection of articles about Immortality indicate a serious interest in the topic of personal survival.