@Gwydden: Thank you for the great response - I know it will likely upset a few, but instead of diverting to a PM, I'll continue my response here. I hope anyone looking to specifically discuss Arlathvhen and elven culture exclusively can excuse me. I will try to add discussion about spirits, elves or what have you as I go to make it topical.
"Is that what you are arguing for? Innocence, faith, and purity are all overrated in my book. I had more of each of those during my childhood, and I do not lament their lost. If anything, I feel more complete. I'd rather take the roses with the thorns, and some burdens are a joy to carry. What is the point of ignorant bliss? My line of thought is fairly simple and, you will find, doesn't require humanity to have any objective, inherent worth that makes it superior:
1) I am human.
2) I like being human, and would not be anything else.
3) Therefore, being human must be good and worthwhile."
No humans should not seek ignorance as bliss. It is against our natures. In a Biblical sense - we have been cast from Eden never to return. Eden is very much a state of mind to me... like the Fade. Eden - as "state of mind" - would be that "Innocence, faith and purity" we abandoned in our evolution and then again from children to adults. In the metaphor of the Bible - Eden is closed, we can never return to our animal natures. We "sinned" by eaten the apple of the Tree of the Knowledge of Good and Evil... and because of this - we are burdened with responsibility (the rest of the Bible details that responsibility).
If we have a responsibility at all - it is not to God. Any such being - if it is to exist - does not "need" us to do anything. It is first, to ourselves, then to other (and other "should" encompass not only humans, but also the aforementioned 8 million other species sharing our rock - and also "the rock" itself).
Though I unquestioningly appreciate the ethics of texts like the Bible, the Bhaghavad Gita, the Tao Te Ching and other religious guides... I am also a student of Aristotle's Nichomacean Ethics and the Analects of Confucius (ultimately - it doesn't matter what texts are read. The conclusions are common sense I believe. I book list only to illustrate that my opinion is not derived from any singular body of work.)
All ancient philosophers were concerned with the "responsibility" of mankind... a humorous notion since the ancient world is "supposed" to be inferior to today which is unashamedly apathetic and amoral with moral relativism being a guideline for self-appeasement and ego. Epicurus would spit on anyone who claimed his hedonism is that of today's self-absorbed materialist.
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Concerning the Darkspawn and our own world - I believe we genuinely do have empirical evidence to show that both the pre-darkspawn and the pre-human worlds were "better".
Yes, other organisms can do - in infinitely smaller scales - what humans can do. But animals, as a rule, do not do those things needlessly. Animals and plants are invasive only because we move them. Animals do cause waste - but the levels of animal waste in an ecosystem is manageable by that ecosystem and that is entirely the point.
To discuss whether humanity is better than "nature" is, for me, an easy one. Humanity creates problems that nature cannot "readily" fix (this was not the case for 200,000 years of human existence - only the last 200 or so - frightening "impressive" I suppose)... and then "corrects" them by creating more problems unto a level compounded so greatly that now all life on earth in endangered. The comparison to a virus is not an unfounded one.
Do supervolcanoes do this? Do meteors do this? Of course they do - but one must assume that a universe that is 13 billion years old has contingency plans for things generated from it. And... let us be clear. Do we want to be equated to forces of annihilation? Is it a honor to be as destructive as a supervolcano or meteor? Double damning when you consider that we actually had a choice of being such a force of oblivion.
1) If evolution "can" result in sapience.
2) And sapience "can" be self-destructive.
3) Then the universe tends toward suicide.
That conclusion go way beyond the notion of entropy. If they universe "tends toward suicide" then it is all, factually, a "waste of space" - leaving any such notion based on a "efficient" universe as a preposterous notion. Of course - the universe, being so vastly superior to us is likely unphased by our arrival and ultimate passing - leaving it free from this "suicidal" tendency. On Thedas - the universe has responded with Darkspawn. The Blight DOES heal... one could consider a form of fantasy "chemo". It damages the host to kill off the cancerous tissue destroying said host. Ultimately, if successful, the body heals and the cancer is gone.
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But, is that the point? Is our irrelevance a "get out of jail" free card that should allow us to utterly lack responsibility to ourselves, each other, and ultimately the universe? It is not a matter of "helping" the universe - the universe does not "need" us (as a God would not "need" us) - it should be an honor, and a privilege to serve the universe by our mere existence.
The fact that the world can annihilate us if it "has to" - should not be considered something that exalts us in our deviancy. We should not celebrate our iniquity.
And ultimately - that is the manifestation of demons on Thedas. Mortals who not only embody, but celebrate (even if subconsciously) their "sins" by believing that there is nothing wrong with being imperfect.
NOTE: Perfection is unachievable - I believe the point is in the striving toward betterment. In that - I think we come to similar conclusions from different angles.
NOTE 2: You might also notice I did not add "preacher" or its like... I am adamantly against all human institutions - be they religion, government or ideology. Science is not an ideology - scientists have formed one around it. Refuting this is of course imperative to said group... but the more they refute, the more they take on the attributes of a dogmatic group.
One need only look so far as the no longer planet "Pluto" to discover scientists tendency toward institutional dogmatism.