Here are some steps to a dialectic for arguing against the permissibility of abortion:
> I. What grounds a right to life? > II. Propose Consciousness > III. Come up with intractable counter-examples to proposal > IV. Search for criteria that canvasses counter-examples correctly > V. Animalism is the only criteria that does so > VI. Various other pro-life arguments
I think a very plausible way to argue against the permissibility of abortion is by first starting with the idea of consciousness as that property that grounds the right to life. This seems initially quite plausible, right? But when we proceed to cases, we begin to see that consciousness is much too flickery a property to ground an inviolable right to life.
It’s step (III.) in the above dialectic that requires the most support. So here’s some quick cases:
We possess a right to life even in deep sleep, and it would be wrong to kill us while we're in a deep sleep, despite our not displaying consciousness.
Imagine a man in a coma for 9 months that *will* wake up at the end of the 9 months. Is it permissible to disconnect him? Presumably not.
Imagine an alien species that matures to adulthood but, every 5 years, returns to a fetal-egg state for 3 years. After this 3 year period they reemerge as adults with their memories and consciousness. Was it permissible to kill the aliens in their fetal-egg state? Presumably not.
So consciousness does not ground a right to life.
One difference in the above examples vs. the abortion case is that of resumed memories. In each of the above three cases the person had memories prior to their consciousness being paused. So is it past-memories that grounds a right to life? That seems wrong, too. For consider the following modified case: The man in the coma that *will* wake up in 9 months time will have lost all memories prior to his coma. Is it now permissible to kill the man during the 9 month period? Still, presumably not. And if this is so, then it seems like consciousness or past-memories are not sufficient to canvass all the creatures that have a right to life.
So what other possible criteria could we propose that would correctly canvass all the cases?
The most plausible answer to this question, one that correctly canvasses all the cases, is the idea that our kind-membership gives us the right to life. As long as we’re the sort of being that can normally be rational, conscious, moral-decision makers, etc., then we have a right to life. Notice that this criteria is a sort of second-order property. It isn’t consciousness itself that gives the right to life, but membership in a *kind* that normally is capable of consciousness. So while the sleeping person doesn’t currently exercise consciousness, they’re the sort of being that are usually capable of it. The same reasoning applies to the coma case, as well as the alien case--and, I think, to the human fetus.
One more line of reasoning is useful here. It’s the question of what sort of beings we are--what are we, as humans? Animalism holds that we are our human animal. C.S. Lewis was wrong: We aren’t souls that possess bodies. We're human animals that have an immaterial part, our souls.
This point leads naturally to the question: When did *I* begin to exist? Well, if I’m my human animal, I began to exist when the animal that I am began to exist. And when did the animal that I am begin to exist? Science gives us one answer: At conception. Conception is not an arbitrary moment like birth. Birth can occur at any point within a few month period. It’s not a natural cutting point for when I began to exist. Conception, on the other hand, is a clear-cut moment at which a new life with a new set of DNA begins to exist. I was once a zygote. And it’s wrong to kill me at all points of my existence. The zygote possesses an intrinsic self-directed process that will not halt unless something extrinsically interferes with it.
I think there’s an allowed break at this point: Either our personhood is essential and grounds our right to life, in which we’re persons even when we’re sleeping, or our personhood is a non-essential property of us and it’s some other property that grounds our right to life--such as “we’re the kind of being that should have personhood under normal situations.” I’m ambivalent on which path should be taken here.
Supplementary Arguments:
These are just a hodge-podge of arguments that I won’t expand on for now.
The 95% strength to pro-choice arguments isn’t strong enough argument.
Maternal attitude argument.
No maiming fetus’s argument.
Right to life doesn't come in degrees, yet consciousness does. So must be something that’s an either/or property. Kind membership is either/or.
Each fetus deprived of life is a unique human animal that’s been deprived of life.