And this is exactly where you are wrong. You will never see out of the copy's eyes. Never. No matter if the original is killed or survives, no matter what conditions or circumstances, YOU will never experience through the sensory input of the duplicate... because you do not share a continuous, dynamic existence with the duplicate. At no point are you connected in any way to this twin. For that is all the duplicate would be - a twin. A brother, perhaps, and nothing more.
Now, it is true that the duplicate itself will feel exactly as you felt up to that point; that the duplicate will share memories and feelings and thoughts up to that point; that the duplicate's internal ID will be the same as yours, up to that point; but the continuous and dynamic awareness you possess never magically transfers from A to B. There's nothing TO transfer. It would be foolish - indeed, suicidal - to use the teletrans.
You keep balking at discussing ethical ramifications in these duplications experiments, but the fact is, we're not talking ethics; we're adjusting the conditions in reasonable ways to demonstrate that at no point, EVER, are you magically transferred into a duplicate. And if you would balk at being placed in cold storage, or being killed a week later, or being used as a slave after your duplicate was made - then why wouldn't you balk at the teletrans problem?
Another simple question: if, at the exact moment of duplication, the original was staring at a large letter "O" and the duplicate, a large letter "X", what would YOU see at the instant of duplications? An X? An O? Both, superimposed?
Think about it.