I’ll set aside the issues I have with determining that someone gets rights because they have some chance at becoming an adult, though I have those as well. Mainly, I’m just confused about why you’d set apart adults from other stages of development in this respect, and then turn around and say that all stages of development are equally worthy of the rights they are responsible for founding. It strikes me as odd that you would both set this stage of development apart and treat them all as equally valuable. If I might streamline this, what you seem to be arguing is that self-preservation is the reason human rights apply further back than an adult. The input (at least for you) is the zygote, the output is the adult, and disrupting any part of that development chain should be treated in the same light.
"So regardless of "when” a cell becomes a human - abortion is already immoral."
I’m not so sure that my point buys into this. I’m arguing that any arbitrary selection is problematic, but that means if I can present reasons why the zygote is similarly an arbitrary selection, then any stage of gestational development could be viewed as similarly justified as the point at which it “becomes a human”. Not really the argument I’m focused on, but we can delve further into this if you want.
“Any differentiation of post-fusion is arbitrary and has no real weight.”
Alright, though I’d say that fusion itself is an arbitrary selection.
“I am not claiming that a fetus "has the potential to become a human"”
I never said that’s what you were claiming. If you look back at what you said regarding potential, you said:
“A sperm cell and an egg cell cannot become a human on their own - this combination is simply a "potential" human being”
So what you’ve done here is afford the “potential” label to the individual gametes (though even that’s not entirely true, because that “potential” exists whether they’re entirely separate or right next to each other). You’re drawing a line (fusion) and saying that crossing that line turns one into a human. I’m challenging that supposition, largely because the argument you’re using – that potential to become an adult makes one valuable – applies just as strongly to these “potential” human beings as it does to any subsequent step. You talk a lot about the difference between a qualitative change and a quantitative change, but if we’re going to play that game, then we should do so consistently. The only difference between the potentials of individual gametes and a zygote is quantitative: the latter is far more likely to eventually become an adult than the former. The tacit implication of your points is that we should never base our assessment of whether a stage of development is or is not human on a quantitative measure, yet you appear to be doing just that here. Your split between a “potential” human and an actual human is built on a quantitative evaluation.
As for examining why this line isn’t arbitrary, let’s get into that.
“1. All humans have equal value - therefore we must choose a single event that makes a human a human (or dismiss human rights as subjective)”
At best, this establishes why there’s a need to know that a single event results in humanity – it doesn’t tell us what that event should be. Still, I disagree for multiple reasons. First, if we must know of a single event, then I would argue that we must also know of a single moment. The problem is that fusion is a series of moments. Calling attention to any one is arbitrary, yet entirely necessary based on your reasoning. Second, I don’t see a problem with having some subjectivity in human rights, particularly as they apply to the unborn. I’ve heard this argument before, but I’m unclear on why saying that there is uncertainty in when a human life begins inherently messes with all human rights. Third, if anything, I’d say that the arbitrary selection of a single event does more to harm human rights because it automatically sets groups apart. The sperm and ovum aren’t deserving of rights because they don’t meet this threshold. If, at some future stage, we can generate new embryos or blastocysts without fusion, this would exclude them as well. It automatically otherizes, whereas saying that uncertainty exists recognizes the blurred lines between what is and is not human, allowing us to confer human rights without such constraints.
“2. Conception is the single QUALITATIVE change that happens. (pregnancy starts de facto with conception)”
Two problems. First, on a fundamental level, I disagree with the characterization that conception is purely qualitative. I can reduce conception to entirely quantitative aspects, if you wish. In fact, every stage of development could be viewed in a similar light. Simply because I can make statements like “we define the start of pregnancy as conception” doesn’t mean that the change itself is qualitative, only that our perception of it is. Second, if a qualitative change is all we need, then I don’t see why I can’t apply this to any other stage of development. Insemination is a qualitative change. Sex is a qualitative change. A beating heart is a qualitative change. A working nervous system is a qualitative change. Independent viability is a qualitative change. Yes, I can reduce every single one of these to quantitative changes, but by your metric, they all yield a qualitative shift. Conception is not the sole qualitative change that occurs, so why should it get preference?
“I also want to point out that the difference between a gamete and a zygote is qualitative, not quantitive.”
You don’t really justify this. I’m sincerely trying to find the argument that supports this, but your only arguments focus on DNA, which both gametes and zygotes have. You also tie yourself in a bit of a knot here, so I’ll give you the opportunity to untangle it. You argue here that “DNA in itself does not grant you human rights – your own DNA only grants you the status of being a human.” Three sentences later, you argue “Therefore, what has human DNA has rights if humans have value.” The logical progression, therefore, is that DNA confers humanity, humanity confers human rights, ergo DNA confers human rights. Maybe I’m missing something, and I’d appreciate if you could clarify what you meant. Several times, you also say some variant of “killing of all the cells with the same full set of human DNA is murder”, though even this seems somewhat problematic. Henrietta Lacks is most certainly dead, yet her cells live on in HeLa cells grown in labs across the country. If she was killed by someone else, by your view, that would not be murder. Similarly, if we grow artificial human cells in a lab and modify the DNA, we are technically committing murder by getting rid of all the original cells. Maybe this is just me being technical, but your definition of murder still seems sketchy to me.
“Human DNA is innately valuable. No, it merely identifies a cell as being human. This means that DNA only tells us WHO are humans. Killing all cells with the same DNA is murder.”
Yet your argument is that the quality of being human is innately valuable. If having human DNA makes you human, and humanity is innately valuable, then it stands to reason that human DNA is innately valuable. I don’t see how I’m misrepresenting your argument here, I’m just pulling the pieces of your argument together.
“"Potential" for becoming a human gives one value. No. But the potential for becoming an adult gives you the same value as an adult. Killing a child is equal to killing an adult.”
I think you mean “Yes” because your explanation confirms the statement is true about your perspective. If the potential for becoming an adult gives the unborn the same value as an adult and adults are due human rights, then yes, the potential of the unborn to become an adult affords them human rights. I’m not sure why you view this as a misrepresentation of your argument when it is literally the argument you’re giving me here, again.
“Value is inherent in the traits. No - that would be discrimination and a violation of human rights. The only trait that matters is the fact that I am a human.”
I’m also not sure why you’re pushing back so hard on this one. You’re saying that a zygote has distinguishing characteristics from gametes, and that those differences are sufficient to grant the former human rights and exclude the latter. That’s putting value on a set of traits, plain and simple. Maybe you’ll argue that it’s putting value on the qualitative change itself (i.e. fusion), but if I extracted zygote and put it side-by-side with a set of gametes, you’d still say that the latter is due human rights while the former is not, correct? You don’t have to know that the zygote has been through fusion to grant it those rights? Then it is inherently a separation based on traits.