I still have not read any other posts or your replies to them, but I don’t foresee any problems with the direction we were headed. Should I repost my last question or can you find it easily enough?
Please do, so there will be no confusion or misunderstanding. Though I am about to present my views in detail in the following paragraphs. I hope they will be useful.
It may be a medical fact that removal of the frontal lobe has the mental effects you describe, but I’m willing to bet there is no book on biology or medicine that defines a person who experienced such a procedure as non-human. His state may be described as vegetative, but biologically he is not a vegetable. He is still a human.
I said: “not a PERSON!” I did not say: “not of human TISSUE”. And to be a person is much more involved than having a DNA, which is associated with human entities. Not to mention that there is no such thing as a
precise, definitive human “DNA”. How about “mutants”?
Modern genetic surgery/splicing allows us to transfer the DNA into the zygote of a different species, thereby creating a “chimera”.
What basic textbooks on embryology all say is that human life begins at conception.
That is not disputed. Every oak tree starts as an acorn. Every chicken starts as an egg. Every physician starts as a medical student. Every book starts as a bunch of empty sheets of paper. Aquinas correctly differentiates between “potential” and “actual”. Even if you are not a thomist (I am NOT), this distinction is valid, and needs to be taken into consideration.
However, as long as there is a resistance to acknowledge the difference between DNA, cell (zygote), collection of cells (blastocyst / tissue), organ and organism, I cannot see a way to go forward. If someone disputes this differentiation, then a tumor “becomes” a human “being”, maybe even a human “person”.
As I said, there is the distinction between “potential” and “actual”. Not just in the Thomistic philosophy, but everywhere. A zygote is a potential blastocyst, the blastocyst is a potential embryo, the embryo is a potential fetus, the fetus is a potential newborn. Between each step there is a huge, qualitative difference between these entities.
The whole abortion debate should (and MUST) acknowledge these different stages of development. Otherwise we just keep on talking past each other.