Nyarlathotep is the part of humanity that wants something, anything, but the status quo. Pretty much by definition, we don't want to keep that around. Even if you want humanity to escape its cage, Nyarlathotep would be destroyed in the process. The only way to keep Nyarlathotep intact in the long run is to keep humanity imprisoned, and also ensure they never loose the desire to escape.
Unending Chaos is bad, yes, but so is an unchanging Status Quo. The drive to change, as well as to destroy, is intrinsic to human nature and without it we wouldn't have nearly an advanced culture and technology as we have now.
What I am defending is not the preservation of Nyarlathotep himself, but of what he embodies. I don't mind if we get rid of the side-effect, as long as the process continues to exist.
Nyarlathotep is not actually The Ebon Dragon. He doesn't particularly get anything out of fucking people over, its just that the obvious way for him to fulfill his purpose is by killing everyone.
What I meant with that, was to say that we can't trust what Nyarly says at face value. Just because he asks us to do it (please kill me utterly so that I cannot reform) and that doing it
sounds like a good idea (killing Nyarlathotep for good means he can't prod humanity down the path of self-destruction anymore), it doesn't mean that doing so actually
is a good idea (because getting rid of him for good can cause permanent harm to the human psyche).
Not having what Nyarlathotep embodies is probably bad for Humanity's spirit.
"...Fear is justified, for I
am evil, but that is not all which I am; every scientist seeking to bend Kagutsuchi to their whims, every justified rebel, they are also me."
If we can keep what he represents without having
him, that's fine. If keeping that inevitably means having to deal with him... well, he's been active for a long time and Humanity hasn't self-destructed yet. And now we have a High Compassion Solar Exalt to help guide us.
But before we commit to destroying Nyarly for good, may I suggest actually understanding what he is, how he is and why he is? We can at least make an informed choice once we can answer those questions.