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Full Idea
The 'no trade-off' position: killing may be justified if it prevents other deaths, but not in defence of the quality of other lives, or by the miserable life of the person killed.
Gist of Idea
The 'no trade-off' position: killing is only justified if it prevents other deaths
Source
Jonathan Glover (Causing Death and Saving Lives [1977], §12.2)
Book Ref
Glover,Jonathan: 'Causing Death and Saving Lives' [Penguin 1982], p.155
A Reaction
As a utilitarian, Glover opposes this, since death is not the only source of unhappiness. Would we (if necessary) kill a terrorist who was burning down all our art galleries or churches? I would, if it was the only way.