>
a unilateral mercy killingI can't stop you from describing it that way, of course. But
that description presupposes that, always and everywhere, the potential person, i.e., the zygote/fetus, must be valued more highly than the actual, currently-living person in whose uterus the zygote/fetus is gestating.
You're free to believe that if you want — just as you're likewise free to believe (as an extreme example) that the human race would be better off if all important decisions were made by the British monarch, or white Christian males, or a council of imams, or the emperor of Russia, or the Chinese Communist Party, etc.
But you should expect major pushback if you insist that everyone else must defer to your belief — especially if, in their judgment, doing so would drastically degrade their lives.
Again: The least-bad option is: 1) to recognize that the pregnancy-continuation decision is often best made on a case by case basis and not with a one-size-fits-all rule; and 2) in most cases — certainly pre-viability, and in some cases, even post-viability — to entrust that decision to the mother and her doctor.