Show how murder is objectively wrong? Sounds like a trick, but I'll bite just to see where this goes. Murder is wrong because killing is wrong. Duh!
"FUN WITH PHILOSOPHY" TIME! First, killing is
not generically wrong, since very few living organisms, including you, RamFel, can survive without killing other living organisms. Your answer is therefore fundamentally flawed.
Let us now consider a Religious Perspective or three. Souls are immortal, by definition, right? Nothing physical can harm them at all, probably including jumping into a black hole for fun. So, with that as a fundamental point, what do souls need human (or alien) bodies for? The standard
claim is that a soul is associated with a physical body for a lifetime, after which the soul is Judged for the manner in which it interacted with others.
It sounds like a Game, with winners and losers. Now, some Religious Philosophies claim that each soul gets to play the Game only once, and other Religious Philosophies claim that any soul can play the Game (reincarnate) many times. As you know, there is not a lot of Scientific Evidence in support of various Religious Philosophies, but here are two fairly interesting/relevant items:
Incorrupt Bodies
Twenty Cases Suggestive of Reincarnation - Wikipedia, the free encyclopedia
The Thing About Games In General Is That Rules Are Arbitrary, And Differ From Game To Game. That story about Adam and Eve eating the Fruit Of Knowledge Of Good And Evil is, to my mind, telling us that we
have (whether literally acquired or not) the ability to
declare, arbitrarily, various things to be Good, and other things to be Evil.
And, simply because different people are different from each other, different people tend to arbitrarily choose different things to declare are Good or Evil. It is the resulting arguments that actually constituted the "Fall of Man", an inability to regain the innocence associated with "living in the Garden of Eden".
So, is murder, the killing of a person, wrong? Someone who commits it may disagree with someone who doesn't; they are simply playing the Game by different rules!
Of course, we have, over the millennia, learned the hard way that it is pretty important for people to play any particular Game with just one set of rules. Here's an excellent example: In the classic board-game "Monopoly", many people play according to a Rule that puts certain money into the middle of the board, and that money can be collected by whoever lands on the "Free Parking" square. This Rule Is Not In The Official Written Game Rules! It is a variant Rule that is simply very popular. So, the point here is,
regardless of what Rules some Game is played by, as long as the players agree to them in advance, the Game will generally be considered "fair".
In the Game of human interactions, murder is generally frowned-upon, because it can remove players from the Game unwillingly, in a manner far outside normal expectations. And, obviously, if murder was widely allowed, the Game could end pretty quickly in a "last man standing" way, with just one surviving human, which is not very useful for letting future generations play the Game!
So, in essence, murder is frowned-upon for purely
pragmatic reasons, not because it is inherently "wrong".
How does the preceding tie to the Overall Abortion Debate? Well, it all depends on whether or not unborn humans have souls, and different Religious Philosophies have different opinions on the matter. If the unborn have souls, then abortion is murder, and if they don't, then abortion is not murder. Science as yet has no widely-acceptable data on this topic; Science hasn't even been able to prove that fully adult humans have souls, much less the unborn!
However, based on the data presented earlier, some simple Logic may apply. The evidence for reincarnation suggests that souls --which by definition are immortal-- can simply and easily afford to
wait to reincarnate into human bodies that
don't get aborted. There may be a long waiting list, of souls wanting to claim bodies for reincarnation. But since souls are immortal, waiting won't hurt them one bit.
