I would put money on the idea that the accords do not protect mortals from the monsters but do protect the monsters from the mortals. Seems like a really stupid idea to make it illegal to follow your own nature when you're writing the laws.
I imagine that if the white council can claim a mortal (I.E. a mortal with some sort of power, even if it's a tiny bit) then they can probably call foul under the accords, but otherwise not so much. For that matter we have a convenient example in the books in the way of the Susan/Bianca/Harry situation. Bianca preyed on a pure mortal, Harry responded with violence and the Red Court took it as an unprovoked act of war under the accords.
Sounds like an answer to that question.
In White Night Harry talks to Lara Raith about the mortals being used as fodder for the convocation. Lara assures Harry the mortals were willing victims. Lara also assures Harry the faeries were trespassers on their territories.
Under the accords, the white council is tasked with defending mortals against attacks by supernatural entities. They are forbidden from involvement with mortal politics - See Turn Coat.
In the short story Restoration of Faith Harry has a conversation with the bad guy to the effect Trolls do not have the right to take any mortals save 'naughty children.'
suggesting there are specifics set forth in the accords which designate what supernatural powers are entitled to do 'legally.'