A person who is "brain-dead" is brain-dead. But a person in a coma, which is technically a "brain failure", is considered legally alive. A person in a vegetative state is also legally and medically alive although he/she may never recover. A working brain doesn't mean that one can think and act rationally. Some may even claim that the brain of those in a coma and vegetative state are alive but not working rationally nor are they living in that they are incapable of relating socially.
All of this is true, of course; but none of it affects the argument. There are certainly many shades of "being alive", but no matter how low the activity, there is still a difference between a person with the capacity for thought, and a person without, a potential person whose brain has not yet been brought into existence.
At this point, I would like to ask you: do you accept that the capacity for thought is a reasonable criteria for personhood?
Let me propose two hypotheticals to illustrate this:
First, supposing it was possible to transplant a brain into another body, so brain could walk and talk and say, "Wow, look, everything's new!"
Supposing the original body was then somehow destroyed. Would the person be dead? Or would they say, "Wait, I'm not dead! I'm still here!" in their new body?
Second, take the case of a person who is actually brain-dead, but the body is still living, supported by machines. Imagine, hypothetically, that a terrible disease has actually destroyed their brain, but science is capable of keeping the rest of their body going. Would you say the person is still alive, just because their heart beats and the lungs draw breath?
The point being, personhood resides in your thinking. Without our brains, we are just lumps of meat; and without a brain, a fetus is just a lump of meat.
According to medical science in fetal development (the bold is mine):
The basic anatomical organization of the human nervous system is established by 6 weeks .[1] The earliest neurons in the cortical brain (the part responsible for thinking, memory, and other higher functions) are established starting at 6 weeks .[2] Nerve synapses for spinal reflex are in place by 10 weeks.
...
And according to abortion statistics reported in CNN news:
91.1% of 2015 abortions were performed at, or before, the 13th week of gestation and 65% were performed at the eighth week or earlier.
I wouldn't mind debating that with you, at another time. I'd be happy to point out that the human brain develops very slowly, and although its structures begin to appear relatively early, they are not actually active until quite late - well past the point when abortions typically take place.
But, with your permission, I'd like to leave that argument for another time, and instead ask you this: would you then accept that an abortion
before six weeks, when the brain is not present, is acceptable? If not, then let's focus on the actual argument at hand.
Furthermore, abortion is used as a birth control method, and it benefits men rather than women. According to a study done by the Guttmacher Institute on the reasons why women have an abortion
That's very interesting, but doesn't seem to have anything to do with our current debate. Remember, I think - and have argued - that the fetus is not yet a person, just a lump of flesh. Therefore, the question of why the abortion happened is not relevant to our present discussion.
Personhood is a moral concept. A person is someone who matters in his or her own right, and who therefore deserves our highest moral consideration. Thus, the brain-dead person and even the dead body of a person is treated with high respect. That brain-dead person or dead body was once a father/mother, brother/sister, son/daughter, etc. And this is why Christians bury the dead with respect.
I think it was interesting the way you said "the dead body of a person". Because that is my view. The dead body once owned by a person. And really, that's the Christian view too, isn't it? The soul that inhabited that body has gone on, either to heaven or to hell, and left their body behind them. Right?
And yes, I would certainly say that we should treat what they have left with respect, and bury it with honour; rituals to honour the memories, and the love and the happiness and the meaning that existed between us when the person was there, inside the body.
We certainly honour that relationship and treat the dead body with respect. But we do not treat the dead body as a person - we don't talk to it and expect it to talk back; we don't keep it around us; we don't worry about its decomposition. We know that the person has gone, and we honour our memory of them, and we bury them.
And the fetus at 1 week old is also a person in his or her own right and who deserves the highest respect rather than to be used as a birth control method.
If you think that a 1-week old fetus (to be precise, an embryo, isn't it?) is a person, then we have to return to our earlier cases. If there was a person on life support
whose brain was clinically dead, I would have no hesitation in having them taken off life support. To leave them on life support would be an insult to the person who once lived, a grisly reanimating of their essentially dead body. This is because, without their brain, no person exists. Wouldn't you agree? Or would you keep a brainless body kept alive by machines for months, years, decades?
It is the same with a fetus, or embryo, or blastocyte; they are potential persons, but not persons; they are just lumps of flesh - as human as an appendix, and as alive, and just as much a person.