Mary Anne Warren on Persons
Here is my outline of the argument in Warren's essay "On the Moral and Legal Status of Abortion"
Warren asks, "What does 'human' mean?"
People tend to assume that "human" means "genetically human." Let us designate that sense as humanG. Warren is interested in a more Kantian definition of "human" "human" in the moral sense (humanM). Kant includes angels, God, and other non-human rational beings (if they exist) as humanM although they are not humanG. Being humanM implies (1) that one is a member of the moral community (i.e., one is bound by the commands of morality); and (2) that one possesses the rights and duties accompanying such membership.
Warren argues that the word "person" should designate only humanM.
Being humanG is neither necessary nor sufficient for being humanM; some humansG are not humansM (e.g., infants, severely retarded people) and some humansM are not humansG (e.g., intelligent ETs, angels, etc., if they exist). None of this is controversial in philosophy.
On the standard view of rights (e.g., the right not to be killed, aka the right to life), only creatures with duties have rights. That is, I acquire a right as a consequence of the fact that I am a being capable of acting from duty in other words, as a consequence of being a member of the moral community. Creatures with no possible duties have no rights. This is why, on the standard view, non-human animals are thought not to have rights. Its because they are thought to have no duties. Some animal trainers (e.g., Vicki Hearne, author of Adam's Task) would dispute this.
Warrens argument is quite simple, then. Its clear that as long as a fetus is a fetus, it has no possible duties and is thus not a member of the moral community. Fetuses are humanG only; they are not humanM. Because "person" means humanM, fetuses are not persons. Thus, according to Warren, they have no right to life and abortion is always permissible. Only humansM ("persons") have the so-called right to life (i.e., the right not to be killed except, perhaps, for a very good reason).
Who are humansM (persons)?
Warren proposes a thought experiment involving an imaginary space traveler having to decide if alien beings should be considered humansM, and thus have the right to be respected as ends in themselves, the right to life, the right not to be eaten, etc. (Friend or food?) Warren says if we encountered beings with all the following characteristics, wed consider them humanM:
Warren says perhaps some of these characteristics are more essential than others. The point is, however, that a being lacking all five couldnt possibly be humanM, and having (1) alone (like a fetus) is not sufficient.
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