Or, perhaps physical body are not absolutely important in the survival of the genes, and that the genes discard the body as soon as they assure their survival after reproduction. There must be certain advantage in the cycle of life and death to the gene. The high cost of duplicating, every so often, a new vehicle to carry itself must be well worth it to the genes in the evolutionary arm race. It's only the id that needs the body, not the gene. We are looking at a new battlefield, where the id, in its effort for self preservation, interferes with the self preservation machinery of the gene.