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, &quot;Hey I have this great idea with lots of societal benefits: Why not kill each person before they reach 100 years?&quot;<p>We would say no, that is insane and pointless, why would we sacrifice hundreds of beautiful years off of everyone&#x27;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&#x27;re at most 35, rather than their current &quot;natural&quot; lifespan?<p>Whether or not death is &quot;natural&quot; doesn&#x27;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&#x27;d just as soon untruncate.