The point there is that, say humans were largely the same but instead we naturally lived a very long time, e.g. a thousand years. Then someone comes to you and says, "Hey I have this great idea with lots of societal benefits: Why not kill each person before they reach 100 years?"
We would say no, that is insane and pointless, why would we sacrifice hundreds of beautiful years off of everyone's life? Indeed, consider that environmental improvements and medical technology have more than doubled the human lifespan. Would you voluntarily choose for your children to live until they're at most 35, rather than their current "natural" lifespan?
Whether or not death is "natural" doesn't seem like it ought to have much bearing on whether or not we want it. If life is good, then loss of life is bad. A beautiful mind that ceases to shine, is something I'd just as soon untruncate.
We would say no, that is insane and pointless, why would we sacrifice hundreds of beautiful years off of everyone's life? Indeed, consider that environmental improvements and medical technology have more than doubled the human lifespan. Would you voluntarily choose for your children to live until they're at most 35, rather than their current "natural" lifespan?
Whether or not death is "natural" doesn't seem like it ought to have much bearing on whether or not we want it. If life is good, then loss of life is bad. A beautiful mind that ceases to shine, is something I'd just as soon untruncate.