I'd like to research exact quotes from the book before doing it, but here's the gist of it in a nutshell.
****MAJOR SPOILERS FOLLOW****
J.K. Rowling and the Unforgivable Inconsistency:
1. In book 4 we're introduced to the 3 Unforgivable Curses. Casting a single UC gets you thrown in Azkaban where dementors suck the joy right out of your soul!
2. In book 5, Harry is enraged when when a curse hurled by Bellatrix LeStrange knocks Sirius through the veil of death at the Ministry. So enraged, in fact, that he casts the Cruciatus curse on Bellatrix in the Ministry atrium. When the curse fails to do any significant damage, she says:
"Never used an Unforgivable Curse before, have you, boy?" she yelled…
"You need to mean them, Potter! You need to really want to cause pain - to enjoy it - righteous anger won’t hurt me for long…"
(OotP pg. 810, US Hardback)
So Bellatrix establishes that a certain level of maliciousness in necessary to cast an unforgivable curse. This is confirmed by Harry's inability to cast it.
3. At the end of book 6, Severus Snape casts the Killing Curse on Dumbledore, killing him. So Snape had to really "mean" that curse, to enjoy it, right? Well, no. Not if it interferes with a plot twist.
4. Now we come to book 7. By my count, Harry himself has cast 3 Imperius Curses before the final battle. No problems, no guilt, no fear of Azkaban. Then in the waning chapters, Harry
successfully casts a Cruciatus curse! Has Harry turned evil? What could possibly incite such rage, when even witnessing the murder of his godfather wasn't enough?
“It’s not a case of what you’ll permit, Minerva McGonagall. You time’s over.
It’s us what’s in charge here now, and you’ll back me up or you’ll pay the price.”
And he spat in her face.
Harry pulled the Cloak off himself, raised his wand, and said, “You shouldn’t
have done that.”
As Amycus spun around, Harry shouted, “Crucio!”
The Death Eater was lifted off his feet. He writhed through the air like a
drowning man, thrashing and howling in pain, and then, with a crunch and
a shattering of glass, he smashed into the front of a bookcase and crumpled,
insensible, to the floor.
“I see what Bellatrix meant,” said Harry, the blood thundering through his
brain, “you need to really mean it.”
(HPatDH p503, US Hardcover)
Um, OK Psycho. McGonagall then promptly Imperiuses Amycus. What the hell, all of the cool people are doing it now. It's only wrong when somebody we don't like does it.
So what's the lesson here? Unforgivable Curses are bad, mmm-kay? And only bad people use them. Well maybe they're not that bad if they're involved in a plot twist. Or maybe if they're any main character at all, then it's OK, and they're not bad and you should probably forget what was said earlier. What was the question? :crazy: