Consider the following story:
Anna is driving her truck at night along an unlighted, winding road. She turns a corner and suddenly, 50 feet ahead of her, she sees a dark mass. She thinks she sees it move. It is about the size of an adult human being, but it could just as easily be a tree branch or a wounded deer. Anna has to decide whether to slam on her brakes (and risk spinning out of control) or to lay on the gas and drive over the thing, whatever it is.
Anna should slam on her brakes, even if Anna feels very confident that the thing is not a person, but a tree branch. General rule: When you’re in a situation like the one Anna is in, act as though you know the thing you’re about to destroy is a person unless you’re pretty close to certain that it is not a person.
I think that, like Anna, we should all be in doubt about whether a fetus is a person, although our ignorance has a different cause than Anna’s does. Anna should doubt that the dark mass is a person because Anna does not know the relevant brute facts about the object. If she knew just a few things about the object (e.g., "those things moving are leaves") then she would be in a position to know whether it is a person.
By contrast, we know many brute facts about the fetus — perhaps far more than we would ever need for the present purpose. Our ignorance about whether the fetus is a person has two sources: 1. the fact that the fetus is a "borderline case," and 2. the fact that there is no clear, uncontroversial set of criteria for personhood. We have "prime examples" of persons — I know I am a person, for instance, and I’m relatively certain you are one too — but we do not have an exhaustive list of "personhood criteria," and therefore cannot help being confused about borderline cases such as the case of a fetus. (Certainly, there are people who claim not to be confused about this question, but I claim they are confused about that as well.)
Thus, according to me, we should all be in doubt about whether a fetus is a person. But it seems to me that there should be no doubt about two conditionals:
1. If the fetus is not a person, abortion is a mostly harmless, and often beneficial, medical procedure;
2. If the fetus is a person, abortion kills a person.
Apparently some people do doubt either or both these conditionals. I won’t defend either of them in this post, but I might be moved to do so some other time. For now, assume without argument that these two conditionals are true. Would there be any doubt in that case that, unless you’re very close to certain that the fetus is not a person, you should refrain from aborting it?
So I’m arguing that abortion is wrong, in the same or similar way that it would be wrong for Anna not to slam on her brakes. But were my argument here successful, how wrong would abortion be? I don’t think it would turn out to be as wrong as many on the pro-life side seem to think it is. For instance, it wouldn’t be equivalent to murder. If Anna refrained from slamming on her brakes and the dark mass turned out to be a person, she should not be charged with murder; I’m not sure she should be charged with any crime at all.
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