I would describe the main character having lost his mind.
To Empathize with the antagonist you first need to determine who the antagonist is then find out there what they stand for and how you would relate to this in every day life.
The protagonists hard to determine because we know of the victim and the antagonist but to find them we have to look at the characters actions. So maybe it would be the police, but i would recommend looking it up just in case. Hope this helped!
