Man. The existential morality of using PIE to shape the course of reality. GOOD or EVIL? That's . . . one of those discussions I never really thought I'd listen in on.
But if the substance of the consequences of the act itself does not have its own inherent quality of good or evil, then how can the /intentions/ behind it determine a similar quality? "Really, I was only trying to provide a better quality of life for my family and my employees. It wasn't my intention to destroy that particular species of flower in the rain forest that cures cancer." "I was just trying to give those Injuns some blankets. It wasn't my intention to expose them to smallpox and wipe out hundreds of thousands of innocent people." "I just wanted to get that book finished while working two jobs and finishing a brutal semester of grad school. It wasn't my intention to screw up the name of Bianca's personal assistant whose death had motivated her to go all power hungry to get revenge on Harry."
There's some old chestnut about good itentions serving as base level gradiant on an expressway that goes somewhere, but I can't remember the specifics right now.
While I agree that the /intentions/ of the person taking action are not without significance, they carry far less weight than the /consequences/ of that action.
"I meant to shoot him in the leg and wound him, not hit the femoral artery and kill him, so I should not be considered guilty of murder," is not something that stands up in a court of law /or/ in any serious moral or ethical evaluation. You had the weapon. You knew it was potentially lethal, even if you did attempt to use it in a less than fully lethal fashion. (Or if you DIDN'T know that, you were a freaking idiot playing with people's lives, something really no less excusable.) But you chose to employ the weapon anyway. The consequences of those actions are /yours/, your doing, regardless of how innocent your intentions may have been.
Similarly, if you meant to drill that ^@#%er through the eyes, if you had every intention of murdering him outright, but you shot him in the hand and he survived with minor injuries, again the consequences overshadow your intentions. You might have made a stupid or morally queestionable choice, but it isn't like anyone *died* or anything. He's fine (at least in the long term), you're fine, and there are fewer repercussions--regardless of your hideous intentions.
The exercise of power and the necessity to consider the fallout from your actions isn't something limited to wizards and gods. Fictional people like Harry and Molly just provide more colorful examples.
As for violating the laws of magic themselves turning you good or evil, well.
There's something to be said on either side of the argument, in the strictest sense, though one side of the argument is definitely less incorrect than the other. But it's going to take me several more books to lay it out, so there's no sense in ruining the fun.
Jim
(PS--Murphy can't be Kumori, obviously. Kumori is a powerful and dangerous necromancer with the personal will to hold a knife to a wizard's throat. And more to the point, she was TALL ENOUGH to do it. If she was 5' 0" Murphy, she'd have had to be wearing freaking STILTS to hold a knife at 6' 7" Harry's throat from behind. To say nothing of the fact that Harry has touched Murphy's skin on multiple occasions and never picked up a ripple of /any/ of the aura of a practitioner, much less the utterly obvious one of a fellow heavyweight. I try to follow my own rules, guys.
)