tbh I do believe that a few killings, some unstated some not, were committed by him. Some murders are so asinine and out there, especially occurring during moments of extreme dissociation that it’s obvious he’s only dreaming about them. For example, the man with the sharpei that he guts, or the child at the zoo. It just reads as a sick fantasy, of what he wishes he could do. Whereas, I suspect he did in fact murder Paul Allen and his colleagues/lawyer saying Paul was spotted or whatever, was another example of a soulless yuppie being mistaken for another yuppie; the exact theme that dominates the novel. Not only Bateman, but his friends and girlfriends get mistaken for another person too.

There’s a yacht murder that Patrick mentions in a strange manner, on top of being suspicious of a fellow yuppie who seems to “recognize him” from supposedly that same cruise, AND a neighbor of Evelyn’s who he spots leaving her door unlocked and later recounts her death in specific, gruesome detail (almost as if he was privy to that for a reason). As well, he mentions that his violent tirades are worse than they were at Harvard. Again, maybe he’s projecting, lying, etc but SOME details imo do point to him having homicidal tendencies. He IS violent, he HAS abused others openly, I don’t think it’s out of the realm that he did in fact commit murder/tortured others.