If you're going to answer your own questions...
Evolution is a pretty simple mathematical phenomenon once you
understand it. When applied to living organisms, it's quite
clear that immoratility serves no purpose to a gene's survival,
and in fact is detrimental in many cases. Once's you're done
reproducing, your body is no longer useful to your genes' further
replication, so no evolutionary pressure to continue is present.
Evolution serves the replicators (genes, roughly speaking),
not organisms.