A couple of things:

First, messing with a monster's mind (apologies to Mr. Butcher if I have it wrong) seems to me a less damaging maneuver because in the Dresdenverse monster's don't have free will, really. 

Humans have the power of choice, and so if someone drills into your head and your human, it does more damaage because it's a more foreign concept to be compelled to behave a certain way than it is for a nonhuman.  As Harry says in several of the novels, with humans, it *always* has a negative effect when someone messes with your brain...it's just a matter of degree.  And it's always bad for both the messer and the messee.

Second, I see the Laws as a good tool to keep the PCs in line.  That's *always* going to be a judgement call based on intention, recklessness, respect or the lack thereof, ignorance, prior behavior and so forth.  To try to settle any situation on the fora is a fool's errand.  Can a GM use it to whack the PCs mercilessly?  Sure.  But GMs always have that option in most RPGs.

Cheers,
Tom