Surely all of the arguments as to when life begins are rendered moot when we are able to make life begin in a Petri dish in the IVF procedure.
Human being are unique and irreplaceable.
There is a cavalier discussion of the future procreative ability of the parent whose petition to preserve the embryos is rejected. Unless she is a woman over 40 or he an azospermic male, it is stated that no injustice is being done because they can just go ahead and reproduce again. Obviously if there was a recourse to IVF in the first place, there was a problem of infertility in one or both partners. The father must willingly cooperate since there is no way to steal his sperm. It is not at all unusual for a father to wish to be rid of his child after it is conceived either extramaritally or within marriage.