Not trying to provoke an argument, but I don't agree with this. I have no desire to discuss the political and social issues lurking just beneath the surface of this discussion, but I think acknowledging that we have a difference of opinion will help avoid potential misunderstandings. With that said, back on topic. Now here's the thing: that's exactly the point. As I said, in this situation, I would use "it" to emphasize that the individual's humanity has been violated. Think of the gebbeth from Wizard of Earthsea, or the un-man from C.S. Lewis's Perelandra. I would intentionally use "it" to make the creature seem more inhuman. Because it's not human. It's a posessing spirit masquerading as a man (or a woman in this case). It's a thing using someone else's body as a puppet.