| | I think Marcus and Ed are off in treating a potential as an actual, an unreasonable potential at that, because most mentally retarded and senile folks have never been cured, nor is there any reasonable sign of a cure for them in the near future. A potential human is not a human.
On Ed's further bit, he seems to accept that rationality is what makes us human. I usually needle Ed when he starts making tests to determine rationalility because inevitably some humans fail his test or some nonhumans pass it. His latest test - cerebral cortex removal - is no different. We could remove the cerebral cortex in other animals as well in such a way that'd make rationality impossible for them too. :-) Digging a little deeper, it seems Ed's test is just another appeal for rationality as the necessary and sufficient criterion for what makes us human. And again, once I heckle Ed (he really is a good sport about this) or anyone else for a rationality test, we wind up with some nonrational humans or some rational nonhumans. Suits me fine, but then again, my ethics don't sink or swim by whether others are rational.
I think Mike is also off in his appeal to "self preservation" in that (1) eating brain-dead grandma will not result in the end of my species or me, and (2) an egoist's concern is primarily to himself, so it shouldn't matter whether the rest of the species (or any other species for that matter) survives unless it provides relatively greater benefit for. Further, I disagree that whom (or what) we harm or don't harm is merely a matter of "taste." That consigns important ethical questions to the realm of subjectivism, a realm I don't think we need venture here.
Sarah,
This might be reiterating Dean's comment. It seems you first accept that you ought not harm other humans, then you ask what humans are. I think this is backwards. I think you should first determine what someone (or something) needs to have in order for you to abstain from harming him or her (or it). Then you should determine which humans (if any) fulfill the criteria, leaving open the possibility that some nonhumans might also fulfill the criteria. Otherwise, you're engaging in a type of rationalization, a reverse engineering your ethics.
Ethics aside, if you're just interesting in figuring out what in reality gives rise to the concept "human," well, why not first practice with what gives rise the concepts of other animals? Also, ask yourself whether you're looking for necessary or sufficient (or both) conditions in determining what is and isn't human.
Jordan
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