Within the Spiderhead, there’s an established binary between the criminals and the “humane.” Absenti makes sure to enforce this by reminding the criminals that they are lesser than. He’s “always reminding [Jeff] about [his] fateful night” (58) because he wants to remind Jeff that he’s a murderer. He does a similar thing later in the story by telling Jeff about all the crimes that Rachel has committed, painting her in an extremely negative light. By establishing this binary, he makes it seem like they deserve the torture they’re going through.
Then, in contrast to the criminals, he establishes himself as being a good person. He’s constantly trying to prove this to Jeff, saying things like “Am I a monster?” (68) and “I’m a person. I have feelings” (72). However, despite his attempt to categorize himself as the better of the two options in the binary he’s created, his actions prove that he’s just as bad as the other murderers in the Spiderhead. He’s fine with killing Rachel and Heather, whereas Jeff “had not killed, and never would” (81).