"No man is an island — " Much as we may feel and act as Individuals, our race is —a single organism, always growing and branching —which must be pruned regularly to be healthy.
This necessity need not be argued; anyone with eyes can see that any organism which grows without limit always dies in its own poisons. The only rational question is whether pruning is best done before or after birth.
Being an incurable sentimentalist I favor the former of these methods —killing makes me queasy, even when it's a case of "He's dead and I'm alive and that's the way I wanted it to be."
But this may be a matter of taste. Some shamans think that it is better to be killed in a war, or to die in childbirth, or to starve in misery, than never to have lived at all. They may be right.
But I don't have to like it —and I don't.
Robert A. Heinlein