Case in point.......A number of studies have looked at the relationship between deer and wolf populations in southern Canada versus the northwest U.S. (where the native wolf populations until recently had been wiped out). What has been found is that deer populations are healthier, stronger, more resistant to disease, and more robust when there ARE wolf populations preying on them. It is because the wolf population, when hunting, don't go after healthy adults, but those that are sick, weak, infirm, old, etc.
As the only known species that has a deep philosophical understanding of death, we hate it. Nobody wants to die. But to try to "cure" it, as is being implied, will utterly lead to a disaster for the species. True, we can keep individuals alive, but what of humanity in general?