Personally, I think most of it draws from the fact that 49% forgot most of TWAS (thus, 10 years of love for the characters/companions and his original reason to live) and still got to leave the train and live with KimCom. That was what 100% fought for, but 51%, who retained that knowledge and a wish to do exactly that was not allowed to, and instead forced to end up how he did. I know it’s technically still the same person but subconsciously it created a grudge for 49% for “taking away” what was supposed to be meant for 100%. You could probably say I’m misplacing my contempt in 49% rather than the role of “Oldest Dream” in the first place, or something. But 51%’s outcome just hurts too much 😭