BUT, HP never used dark magic knowingly
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He used cruciatus on Carrow when Carrow spat in McGonigall’s face.
Mrs VS
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He used cruciatus on Carrow when Carrow spat in McGonigalls face.
Mrs VS
And notice how she didn't bat an eye about it. She tells him it was foolish to come back to school and then to defend her. At no point does she have any problem with him using one of the three unforgivable curses on a Death Eater. In fact, she proceeds then to use another unforgivable curse on him.
Since there's no talk about any sort of bad consequences for either of them, Rowling actually makes a pretty strong statement about what must be done in time of war.
We don't see any good wizards using Avada Kedavra, but I'd love to know what the fsck Mrs. Weasley used on Bellatrix. Loud, messy, and just slow enough so that they know they're being killed.
Someone already called me on that.....I concede and have to re-read that part of the book. Happened in Ravenclaw’s tower didn’t it?