The way I look at it, I accept that a fetus can be considered a person - however I also assert that a fetus is no more a child than a child is an adult. I also acknowledge that we, as a society, make the call that people can and are put to death for reasons of our deciding - one might get the death penalty for murder, but cannot for extremely sadistic rape and torture, no matter how depraved or numerous the infractions, nor the likelihood of recidivism... but espionage or treason against the federal government, even if it does not result in a death, is eligible for the death penalty. There's no equivalency to draw upon anywhere, really - our standards for the acceptability of ending life are already rather arbitrary. I don't go as far as most abortion advocates and try to dehumanize the unborn, likening the process to the same as scraping a mole or excising a tumor, but I do recognize that that to emphasize "it stops a beating heart!" is intellectually disingenuous because we collectively decide to do that every day in other situations which are also much less nebulous on questions of sentience and suffering.