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They don't need to, but if they are not they disappear. Just like when an embryo is aborted because of a disease.

.... :/

That is a view I can't get onboard with. I like people, warts and all. I don't think we should be building a civilization that views humans purely in terms of utility. The point of it should be to support human life and happiness.

I completely understand your point. In my case, my expectations are a lot lower. I became a doctor and scientist in hopes of hedging the bet in life's favor by a little if possible. I don't know what will be the consequences of it or if it will bring happiness or despair.