[Supermancho]

> That being said "killing <animal> fetus" is merely a subset of "killing <animal>" by basic logic.

No, that is not logical. Killing a caterpillar is not killing a butterfly. Known forms of life are not absolute in classification. You have decided to classify a fetus as a subset and others do not. Good luck with whatever.

[Damorian]

They're still the same animal though (e.g. a butterfly caterpillar vs a moth caterpillar). The only distinction, which is specific to this case, is that the words caterpillar and butterfly imply a stage of development where the word human does not, making it a poor analogy. I just want people to stop trying to change the definition of words for the sake of perception.