Also the Laws don't seem to have been quite nailed down in the early books, which makes some of Morgan's stuff seem even more arbitrary.
I do agree with this. The Laws were a little looser around the edges back in the day. For ex, when Harry summoned Chaunzogorroth in
Fool Moon, there was an implication in their discussion that Harry was pressing against the Seventh Law. But the Seventh Law, as explored later in the books, it all about
Outsiders. It doesn't even touch on demon-summoning, which the Council allows (they may frown on it, but they don't forbid it).
Regarding whether the Laws and the effects of black magic match, JB himself has said specifically that the Laws
don't perfectly match the natural consequences of using black magic, they're an approximation. They probably cover the heart of it, but not all the special cases and edges and grey areas.
For ex, Harry probably did take a little taint for animating Sue, but not a whole lot because she's not human and not a sapient being. Doing that with a human would be orders of magnitude worse, and that's why it's out-Lawed.
The Council even allows a few edge cases specifically, like sleep spells for healing purposes, that touches on the edge of mind control, but apparently not far enough to be too dangerous. Harry makes a reference in one of the early books to an 'unlicensed' mind fog spell, which implies that the Council allows those too, in special cases.
Is there taint from using magic to kill a WCV? Probably, at least some. Maybe not as much as with a pure mortal, though. The Laws don't fit perfectly across all the grey areas.
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Oh, she was, some. Not as much as she would have been had circumstances been worse, but there were some effects. She got angry more easily, and was constantly fighting the temptation to do more. But her intentions were
mostly good, and she did likely save Rosie's baby from being born addicted, she took the first steps down the dark road but Harry got to her in time.
Had things gone on in that direction for six months, or a year, or 18 months, before Harry found out...the outcome might have been rather different.