I'd like to read that essay, Sister Magpie.
Heh--I realized after I wrote that it sounds like absolutely shameless pimping!
Looking at it now, it's not that long (for me) so it will probaby just fit here:
...I've seen a number of references to Dumbledore's dying or Snape's killing Dumbledore in order to save Draco from having to do it and thus save his soul. To me that seems just slightly off from what is going on. First, as an aside, I do doubt that Dumbledore would die just to save this kid from murder. I very much agree with black_dog's theories about what happened in the tower being Plan B, with Dumbledore dying because it was the least bad of the bad options, done to salvage what he could. Draco's choice is important to Dumbledore, but I don't think he's specifically dying for it. (That part is in reference to a different essay about just what went down in the Tower at the end, and I tend to agree with the theory. It basically says that Snape is working for Dumbledore and not Voldemort, and that while Dumbledore did finally choose death, it wasn't his plan all along. It was just the best option once cornered by the DEs.)
To say that Dumbledore and Snape saved Draco from having to do the deed and thus have that mark on his soul assumes that if Snape had not intervened, Draco would have killed Dumbledore. Only in the scene it's repeated over and over that Draco can't do that. That is, Dumbledore doesn't think he can, and Draco's actions indicate he can't. He has lots of time to kill Dumbledore and doesn't. (In fact, what he does instead is make a confession, which is good for the soul, literally.) More importantly, there's that final exchange between them, where Draco describes his own position as one of power, "You're at my mercy," and Dumbledore replies that it's *his* mercy that's more important. Malfoy starts to lower his wand. Then the DEs burst in and Draco looks less resolute than ever, unable to even aim his wand, much less kill someone with it. The lowered wand indicates him showing mercy in terms of not killing Dumbledore and, more importantly, accepting the mercy Dumbledore is offering him. His last line about Fenrir, as I said earlier, seems to show more connection to DD than the DEs (he tells Dumbledore he didn't bring Fenrir on purpose). The DEs have arrived after he made the choice in his mind/heart.
So Dumbledore didn't "save" Draco's soul at all, in that sense. He gave Draco the opportunity, obviously, but Draco "saved" his own soul (at least for now) when he chose not to kill. What Dumbledore and Snape saved, if anything, was Draco's life, because Voldemort would have killed him for not killing Dumbledore. If Draco had died at Voldemort's hands because he didn't kill Dumbledore (or if he does die at Voldemort's hands--he might yet!), he would die like Cedric did, in a state of grace (Draco's just confessed and been given absolution by Dumbledore). In the eyes of many that's a kind of a triumph. By contrast, if Dumbledore and Snape had saved Draco from killing Dumbledore, it would be just buying his soul some more time. He would be innocent only due to their saving him from making the wrong choice. He would not be making the choice himself and so still be completely passive. This is different from saving the life of someone who has shown the potential to do something better with it.
I suspect that is why Harry focuses on Draco's wand lowering, and why he has that drop of pity, because that choice to lower his wand was a positive action. I think that puts Draco in just a slightly different position than just a child being protected by others (as he is at the beginning of the book). It puts him on the level of those who can make choices for themselves and might make the correct choice. I hate to think of someone "earning" compassion, but I think that act of Draco's earned him not-completely-hateful feeling Harry has towards him at the end of the book far more than his sympathetic situation did.
This is not to say that Draco's a good guy now or any of that, it's just meant to clarify his position as a slightly more active player, if that makes sense, one who has taken one more step over the line from child to adult.
***
Someone commented after this that Snape hasn't necessarily saved Draco's life and that's true. Voldemort could still kill him for not being the one to kill Dumbledore. But it gives him more of a chance than not.
-m