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The only thing I would say is that Frisk on the Genocide Route is indeed a killing machine. Sparing just one character before Mettaton NEO makes him to believe that Frisk is bad at trying to play pure evil, but on actual Genocide he doesn’t say that. This alone is already an evidence for that. There are also lots of other proofs on Genocide Route, like Frisk not caring about Papyrus puzzles, or his attempts to make us a better person, etc., but I won’t list all of them because those are enough.I don't think the sole explanation for every line of dialogue in a game with a large degree of player choice should be put down to "The other characters manipulated the PC into doing that with their social influencing".
My primary reading of that sparing scene is that, to some degree, the player still has the capacity to see Sans as a friend, and isn't actually just a remorseless killing machine. So an appeal to that can work, just as it can with every other character in the genocide route a run could end at. They don't all have SI, they're just examples of the player's capacity for empathy, which in the ultimately canon form of that route is demonstrated to be absent.