I think the key here is consciousness. Even though our clones would be exactly identical to us, and would do the exact same things that we would do, it would not be our conscious thought controlling the mind. With our limited understanding of the human brain and human consciousness, it's difficult to say where conscious thought comes from (at least I don't know, obviously the brain, but I mean more specifically and how exactly it works). In this discussion we, unknowingly, made the assumption that the conscious thought, as part of the brain, could not also be transferred to a hard drive and the uploaded to a clone. This is starting to get a little mind-fucky, but if that were possible, then I think we would all be fine with dying after the transfer was complete. If you didn't die, then, I guess you'd have conscious control over two different beings, which is unfathomable. Of course, this is all speculation because we may never know exactly where consciousness comes from and how it works, led alone have the ability to transfer it.
In summary, I guess you could say either consciousness is the soul, or that it simply gives the illusion of a soul. At the very least, it's what seemingly makes us not ok with dying after the clone is created your brain transferred.
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