If we are going to start considering potential children lost, then every time a sperm dies from old age, we have to mourn the potential loss of humanity. This also gets rid of the clear line argument for conception being the beginning of human life.
Sure, but those new lives were not created at conception. That's my point here. By your definition, there would be life that doesn't begin at conception. These splits usually happen 4-5 days after conception and both parts of the splits would be made of many cells. So then we have at least one life beginning much later than conception.
Just because there are
additional conditions under which a human being's life can begin, does not mean conception no longer is such. Put another way, just because a person can be killed with a knife, does not mean a gun no longer counts as being capable of killing.
And a sperm by itself is not a human life. Neither is an egg by itself. They are still genetically distinct as subordinate parts of the human whose body created them, and without the process of fertilization will not start growing into a mature human being. This is why conception/fertilization is the boundary line.
I agree that if the head is preserved and kept active, that would be a human life, my curiosity is if the body would count as a human life, even if the head completely dies. I too don't think the body is human, because it has no brain activity. Why does your definition of human life consider this a human though? Here's a better example: if the zygote develops into a fetus without a head, is that a human life? Can it be aborted without killing a baby?
The head and brain demonstrably are the key mechanisms through which human volition acts. People born paralyzed from the neck down are capable of learning to speak, reason, make moral choices, etc.
The body is 'human' in the genetic sense, but it is not a
human being. It is the built-in toolkit most human beings use to interface with the world, but it is not the essence of what it means to be human.
If a zygote develops into a fetus without a head, that's a miscarriage. Which is a very tragic thing for anybody to have to suffer from. If I recall the terminology correctly, it is not an abortion, it's a stillbirth.
From the context of a Christian worldview, and thus involving beliefs I know not everyone agrees with, I consider the brain to be the soul's primary control interface with the body. The soul is what gives personhood, and the brain is the primary tool through which the soul uses the body to interact with the world. If the brain is destroyed, this destroys the soul's ability to use the body it inhabits effectively, and generally kills them besides.
See, in my view, the zygote is 'human life' but not a person. If you allow that logic here for stem cells which can be turned into zygotes, why not with zygotes themselves?
The zygote is a person, because it is a unique instance of humanity that given natural course of development, will turn into a fully-mature human being. A stem cell is not before an external process manipulates it into forming a zygote, because it is not a zygote or any further part of the process to becoming a human being. That's pretty simple and clear-cut, I don't understand why this is a problem for you.
Personally, I see various methods of cloning and similar as only being different from natural sexual reproduction, in that they're a lot harder, more awkward, and more likely to result in birth defects or miscarriages.
Stepping again into the Christian worldview, Biblical literature is very clear on abortion at
any stage being morally wrong,
unless an unhealthy pregnancy is going to kill the mother (not have some mild risks,
will kill the mother), at which point it is
morally mandated.
This is why I like the first occurrence of electrical signals in the brain. It's binary, and it doesn't seem to have any of these exceptions hanging around. Do you (or anyone else) have any arguments against this? I'm honestly interested in hearing them, because I want to develop this opinion.
I don't agree with your position, but I find it to be
pleasantly much more logically coherent than most people these days. You have a clear-cut standard that makes sense within your ideology. Most peoples arguments that support abortion at some point, but not at another, are ideologically incoherent and irrational, fairly clearly the result of trying to reconcile their conscience to the massive cultural pressure to legitimize abortion.
Conception is just as binary. I don't get why you have such a hard time with it.