people like to see things as right or wrong, black and white. but most things aren't. we like to assume that people, even those with potential/developing peoplehood, have a Right to Life. it's an arrogance we have because no one is around to say otherwise. if "lower" life forms don't have a right to life because they're plants or not-people or [name a reason], then how do we defend ourselves when "higher-life" (future) extraterrestrials might think it's fine to knock us off? this is a real problem with the abortion debate. wherefrom does our Right to Life stem?
if we don't have an inherent right to life, then abortion can be based solely on everyone's benefit, decided by the people involved. of course if we don't have a right to life, it puts the whole concept of murder in a wildly different light. even now, with murder generally held to be illegal around the globe, there's quite a bit of it going on. i wouldn't want more of it.
we might best assume that everything has a right to life, or at least a claim to life, and deal with the huge implications of that. good luck to us figuring that out.