I
Perhaps the staunchest empiricist would be required to disagree, though…
I appreciate that line; yes, I’d have to admit to taking the more empiricist view of the matter, at least intellectually! (personally and emotionally, I would of course feel differently). Losing a limb is experienced as bad because one of the uses to which the limbs are put is
ambulation – which is experienced as desirable, as good. Balance is another purpose to which having two limbs are put, and thus balance itself – and the means to it – is experienced as desirable, as a good. There is also the aesthetic aspect of it, of course – having two legs is considered not only normal, but aesthetically pleasing. And no one would want to have a pig’s snout for a nose, even assuming it “got the job done” in terms of breathing comfortably

It just wouldn’t
look right (because we’re not used to it, for one thing).
But I think that, In the ultimate scheme of things, at least from a more purely empirical view, i cannot prove that certain configurations of matter are better nor worse – they just are. Even simple versus complex does not imply of greater versus of lesser value, per se. I can’t prove that a living body is obectively better than a non-living body. If I say that a living body is preferable, then I cannot separate this from the question, “preferable to
whom?” To a vulture or other scavenger, a non-living human body is preferable and, in that sense, good and desirable. It is certainly more useful to them.
I don’t think the situation is really different. Suppose a person who has never seen a car comes across one. It just seems like a pile of metal, rubber, and plastic at first, but after studying it for months, he starts to figure out how it works (which is perfectly conceivable). He does not know anything about the creator of the car. He has not been told that the car is supposed to help you get from one place to another. He does not have the schematics for the engine or anything else. But he still figures out what the purpose of each piece is in the whole and, indeed, might figure out what the whole was for in the first place…
I hope you won’t see this as cheating, on my part, but let’s follow the analogy of an Amerindian tribe (let’s say) who magically discovered a car in a tropical rain forest near the Amazon. Perhaps they spent a good amount of time just admiring the beauty of it (once they got over their fear). It’s a nice red color; it looks really aesthetically pleasing to them. That’s one use to which they’ve put it – they appreciate the sheer beauty of the thing. Then they figure out how to open the door and they sit in it – it has a seat! They are just hanging out on the comfortable cushion of the seat, and a number of other uses arises – they can just sit comfortably in it and have a conversation; or they can lie down and sleep on it. In fact, during a moderate rainstorm, they even find that it is a good source of
shelter – it protects from the rain. A privileged few have slept overnight in the car, and it thus becomes a habitation of sorts. One of them has hidden underneath it, while playing hide and seek; it proved to be a good hiding place, and a good place from which to see others without being seen. Now let’s say, again according to some
a priori magic, that an engineer or mechanic pays them a visit and shows that you can actually
drive this thing and, while you are driving, you can play music! So he shows them how to drive this thing – how, in fact, the mechanic’s principal purpose in creating this car was so it could be used for driving. That’s all fine and good.
Now, would the car be
misused by those who just decided to sit in it, sometimes, not driving anywhere? Perhaps they liked to turn on the radio and just listen to the car’s music. Or perhaps they liked to take a nap on the car’s seat, or – if they had a fight with their wives – lie down on it and use it as a bed, a place to “crash” overnight. Or perhaps they’re using it to take shelter from the rain; or, perhaps, to simply
study it’s component parts, without actually driving it. Are they misusing the car? Would the engineer take umbrage to the fact that they are using the car for a purpose other than that for which it was principally intended? Another engineer could say, “a car has as many uses as human ingenuity can come up with, although it was primarily designed to be used as a vehicle, as a means of transportation. But no, you’re misuing the car in separating its “transportative” aspects from whatever other use for it you are able to find.”
I’m using this analogy, of course, as a way of question whether, even if nature
did have an intended purpose, whether that intended purpose is morally normative (with the obvious connection being with the idea of misusing sexuality, for example).
I’m not an “Eastern religion” guy (far from it), but this reminds me of a Taoist text by a teacher called “Chuag Tzu.” Writes one commentator, “one key to Chuang Tzu’s use of Hui Shih’s relativism is his application to the concept of “use.” Everything is useful from some position or other and there are some positions from which even the most useful thing is useless. Chuang Tzu illustrates this theme with his famous parables of the huge “useless” tree that, consequently, never got chopped down and the huge gourd that was useless to eat, but might make a good boat.”