I did not make an argument yet. I simply wished to establish that it is rational to have a separate rule-set based upon the age as criterion.
Which I am not totally unreceptive to. The problem is that your examples were all special rules that are instituted for the purpose of
protecting younger humans, not of killing them. By
contrast, we do
not correspondingly institute special rules, in general, for the purpose of
killing younger humans, besides abortion. We do not regard it as less morally reprehensible to kill a 3 year old than to kill an 8 year old or to kill a 22 year old or to kill a 45 year old. So you might have shown that protective regulations can be rational, not that a human entity can be sufficiently young to have lost its designation as a human being.
The only definition would be a descriptive one, loosely borrowed from Forrest Gump: “human is as human does”. It should not matter what kind of DNA it has, or if it is a biological being, or if it is a space alien, or a mutant dolphin… if that being is capable of discursive thinking, if it can differentiate between “right” and “wrong”, it should be treated as a “fellow” human being and treated as such.
I am sympathetic to Forrest’s definition, since the idea that things are defined by what they do is at least in principle compatible with a robust hylemorphic essentialism, although I’m certain that is not your intent. Of course, the problem with unreflectively using it as is, is circularity. Human is as human does; for this to be substantive, we would have to know
what a human does, which requires knowing what we mean by
human.
We can, presumably, agree that by “human” entails what would commonly be referred to as adult human. But an adult human is a biological entity whose life is a continuous process of growth, and whose individuation occurred at conception. In that respect, it seems that what “human does” involves the full gestation process.
Any other account would construe require a separate individuation event after the individuation which indisputably occurred at conception. This is where the circularity becomes an issue, and where one cannot but be arbitrary in saying that one starts to “do what humans do” at some subsequent point.
Now the zygote is a potential human being, just like an acorn is a potential oak tree, or a fertilized egg is a potential chicken. However all of these need a certain environment to fulfill that potential, and even in the best case this fulfillment is not assured.
Quite. But an infant human is also dependent on a certain kind of environment, and this is what makes the dependence of a zygote/fetus on its mother an arbtirary standard of personhood.
There is a legal consensus (not implying that you endorse this), or notion at least, that personhood begins with viability. But the obvious issue is that viability is nonstatic, and probing such a conception produces inconsistencies. For instance, a child born early can still survive with our present technology. But suppose that a child is born into an environment where, say, baby formula is not available. As such, the child is
not viable and independent of its mothers body; the child still relies on its mothers body for food. It needs that environment to fulfill its potential, and its reliance on a particular environment does not make it less human.
You talk about the current ethical system. Yes, today, in this society the carcass of a deceased person “enjoys” special consideration, which is definitely arbitrary and also irrational.
All right. Just verifying that in your enlightened ethical system, those who opt out of organ donation need not have their wishes observed. (This is, of course, referring to enlightened ethical systems. I would even agree that organ donation should be “opt out” rather than “opt in,” as certain European nations do it, since that leads to more organ availability, but organ donation is then still voluntary. I do not think any nation holds that one
cannot opt out of organ donation, which is not to say that your view is wrong because few others hold it, just that it is a fringe position which probably does
not cohere with a consistent ethic of reciprocity.)
This is sheer emotionalism. Many more “zygotes” have been flushed out from the women’s body and no one seems to care – even though according to the catholic view, those zygotes were also “children”.
Indeed, they were. But this is an inconsistent view. All people will die eventually of natural causes; it does not follow that objections to killing them
unnaturally are “sheer emotionalism.” If I went to a retirement home and killed the people there, saying, “They were unwanted and a drain on resources. Large numbers of them were going to die anyway.,” I would have a terrible argument. More people have died naturally than were killed by Hitler, Stalin, Pol Pot, etc., but any serious system of ethics would have to regard the avoidable genocides as less acceptable than the natural deaths.
Also, to say that no one cares about miscarriages seems to be patently false.