From what I've seen of many stories, scp 096 was actually a normal child who looked ugly, which caused him to be insecure, so insecure that he then grew up as a monster who doesn't anyone to see how ugly his face is.
What if scp 096 was cursed,this makes sense because it seems he doesn’t like killing and in the scp universe this kind of thing has happened before also scp 096 probably exiled himself to the mountains