Killing adult healthy-minded humans (who want to live) is obviously much worse than killing non-sapient human infants. But historically attempts to single out a group of humans to assign moral value to have turned out badly, so we try not to do that.
Killing adult healthy-minded humans (who want to live) is obviously much worse than killing non-sapient human infants. But historically attempts to single out a group of humans to assign moral value to have turned out badly, so we try not to do that.