zzz_pt
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@Imari said: "Why should "sperm+egg" have right-to-exist, but neither the sperm or the egg should?"
Yes I do realize I have drawn a line. Where that line is drawn is at the heart of this debate. Sperm or egg cells independent of each other cannot produce offspring by the normal mammalian reproductive process. While a sperm or egg cell in isolation does possess unique genetic information, that information is useless until the two cells unite.
Concerning in-vitro fertilization, which does represent an intervention: As there is insertion into the host where (hopefully) further growth by normal processes will occur, my viewpoint does not prohibit abortion in all cases, so neither should it prohibit in-vitro fertilization.
A clarification: I forgot to say that; prior to uniting, "While a sperm or egg cell in isolation does possess unique genetic information, that information is useless until the two cells unite." Therefore, only after conception does a unique life exit.
Two cells united inside a woman's body. A foetus independent from a womb can not develop into a human being either.
After conception, those cells are useless without a third person's body.