Full Idea
It is not wrong to kill because of the intrinsic value of life or consciousness, or because people have a right to life, but because we shouldn't reduce worthwhile life, or thwart someone's desire to live, or inflict fear or pain.
Gist of Idea
What matters is not intrinsic value of life or rights, but worthwhile and desired life, and avoidance of pain
Source
Jonathan Glover (Causing Death and Saving Lives [1977], §8.1)
Book Reference
Glover,Jonathan: 'Causing Death and Saving Lives' [Penguin 1982], p.113
A Reaction
This is a utilitarian view. It is not clear how we decide 'worthwhile' without a notion of intrinsic value. It is unclear why this desire is respected if many other desires are not.