it's made of people

Is it morally wrong to take a life? Not really, say bioethicists.
...
Ultimately their aim is to justify organ donation after cardiac death (DCD). This is a state in which a patient is neurologically damaged and cannot function without a respirator. Within minutes of withdrawing this, the organs are removed. However, the authors state frankly that the patient is not dead at that point because it is possible that the patient’s heart could start beating again.
...
"[I]f killing were wrong just because it is causing death or the loss of life, then the same principle would apply with the same strength to pulling weeds out of a garden. If it is not immoral to weed a garden, then life as such cannot really be sacred, and killing as such cannot be morally wrong."

comparing human life to weeding a garden... classy.

Daniel Callahan has suggested strict age cut-off s for scarce life-saving interventions, whereas Alan Williams has suggested a system that allocates interventions based on individuals' distance from a normal life-span if left unaided.

- The Complete Lives System

like a used car, once you've driven it off the lot, your life is already depreciating... worse yet; you can't trade it in.

THIS is the slippery slope we've been warning about... when it becomes a "judgement" that someone is not deemed "alive", then it is justifiable to kill someone without regard to them as a human being... this is the dirty little secret of many liberal policies, from "death panels" to abortion... when life has only subjective value, and not ABSOLUTE value, this is the world we will be living (and dying) in.

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source:
Is it morally wrong to take a life? Not really, say bioethicists
in BioEdge - by Michael Cook - 27 Jan 2012

The Complete Lives System
Lancet 2009; 373: 423–31
Department of Bioethics, The Clinical Center, NationalInstitutes of Health, Bethesda, Maryland, USA
by Govind Persad BS, Alan Wertheimer PhD, Ezekiel J Emanuel MD
Principles for allocation of scarce medical interventions