Source Page. Credit is to SMBC-Comics and even more credit to @aperson@beehaw.org who noticed it was missing and found the credit in this comment. Sorry about that and thanks, you’re awesome aperson <3
Two people can be literally the same person. Your argument only works if there’s a magic law that says there can be only one real ‘you’.
You’re the kind of guy to argue that when I cut a sandwich in half then there are two sandwiches.
The “magic law” is just the consequence of what it means to be the “same” person. To be the same person, you have to, among other similarities, take up the same spatial-temporal space. This is why if we ask “is Bruce Wayne the same person as Batman” one of the first thoughts is “you know, I’ve never seen them in the same room before.”
Maybe what you’re getting hung up on here is the split. Let’s imagine there is one river (river A) which goes for a bit before it forks and becomes river b and river c. In some sense, we could say that both river b and river c are river a. But if you’re river b, then river c is not the same as you, and vice versa.
In the moment of copying, they’re the same, after that, they’re diverging through different experience. The difference in atoms/location is irrelevant from the perspective of that person’s consciousness. They both are the original in any sense that counts for them or others.
Am I not the same person as I was yesterday?
Sure, I am now different both to a molecular level and due to the experiences I have made since, but for all linguistic and social intents and purposes, I am the same person I was yesterday. Because “person” is already an arbitrary term we put on this collection of atoms merely based on continuity, like the Ship of Theseus. If we went by “spatial-temporal space”, then I would be space dust, a collection of bacteria, fluids, cells, proteins… and who “I” am would change every few seconds.
The same is true for two Rikers. That’s the entire point of the episode; that despite them diverging at the point of the cloning into two different people, they are still the same person and need to live with that.
There’s actually a book series I enjoy, the Bobiverse series, that does an interesting take on it. In it a human, the eponymous Bob, gets digitized and becomes the AI of a Von Neumann probe. He’s given the mission to make copies of himself, explore the galaxy, and build colonies for humanity.
Later on in the series...
As he makes more copies of himself, it’s found that the personality of the copies diverge more and more the farther from the original that they descend, and they eventually devise a statistical way to measure this divergence. No two extant Bobs are ever the same person, even though they’re identical copies.
However, it’s also discovered that if a Bob makes copy of himself, shuts down his original AI matrix, and only then the copy is turned on, that Bob will have no measurable divergence from the one he was cloned from. It’s measurably the exact same individual, and it implies that in-universe there’s some fundamental, tranferable property of identy. Arguably some kind of “soul”.
Not only that, if the original AI matrix is turned back on then that one starts displaying the divergence that was expected of the copy. This is used in one case to transmit the data of a Bob to a waiting, empty AI matrix around another star to avoid physical travel and side step the teleporter problem.
There’s a lot of sci-fi hand waving in it, but I thought it was a fun way to approach the question.