Avernite - you are insisting he didn't engage in black magic, but you're basing that on your own opinion. You have failed to provide any evidence that it wasn't black magic, other than assertions. Considering how little information on black magic we have, that is understandable. But you need to do better and find some references to what does or doesn't qualify to support your argument.
The only solid things we have on black magic are:
1) the Laws
2) the Laws are incomplete
As such, I feel I am entirely within rights to oppose the positive claim (it was dark magic) with a negative (no it wasn't).
Now, I can add attempts to tear down the additional positive arguments why it IS black magic, which is what I've been doing. But there really isn't much 'evidence' to go on. We know Harry didn't violate the Law. We know the spell itself didn't obviously violate the Law, since it only killed vampires, not humans (though see the end of the post). So the only reason it could be Black Magic are:
- Killing Vampires is Black Magic, and a hole in the Laws (I see no indications of that in all the Council's war - we know Black Magic leaves a stain, and most every Warden has killed Vampires with magic, so it would have gotten noticeable)
- Using anything powered by human life, or just another's life, is Black Magic (which would make a Death Curse potential Black Magic, but at that point, who's counting?)
Now this last point, I cannot easily counter; we've seen (to jump series) the Alera books do consider magic-from-another's-life evil, but in the Dresden files every other use of human sacrifice I remember has been for obvious evil magic.
As for the whole Archangel supporting his actions - 1) that's not been confirmed, but even if it was an archangel speaking through Murphy as others have pointed out that doesn't necessarily mean it was Right. Jim's whole point in the quote I provided is that Right and Wrong aren't necessarily owned or defined by the "good" or "bad" guys. A recurring motif is that there are lots of elements of grey (which even Harry isn't sure of) in morality. You might disagree, but that's how the books are written. I would also argue that just because the Almighty (TWG) thinks its okay to do mass destruction, genocide is genocide and many people might have a small issue with it. Including Dresden.
There are good and bad guys who have some bad and some good still in them, respectively (though I can't find back which post contains the quote you refer to). There are also literal VPs of creation who Fall if they do evil. So if the VP of creation says it's Good, you've got a good path there. In a world where there IS a final Judge of Good and Evil, said Judge can make absolute judgements.
Now, indeed, the said presumed (but not proven, and it matters) Archangel didn't say 'dear Red Court, you must all die, but through your own method', so it is possible that this was the wrong way to annihilate the Red Court, but it seemed pretty obvious mass destruction of the Red Court was sanctioned by the arbiters of Good and Evil.
For those that argue that the half-vamps are not human enough, may I remind you that Thomas is mortal enough to be Winter Knight. Think less like the White Council and think more cosmically about Choice and things will get clearer.
I would say rather Harry didn't murder them. He took away the crutch that extended their life unnaturally. That it didn't work the way Wizard-extension does is a clear enough sign that the human was essentially dying very long. Kind of like how ending ICU treatment on a terminal patient, while the immediate cause of their dying then and there, isn't a killing (while killing a healthy 90-year old, the wizard in comparison, is a killing).