Z, here's a little thought experiment for you:
You enter the transporter and lie on a bed. You are anesthetized, and five minutes later the machine makes a copy of you. Then someone comes in, moves the original body to another location and puts the copy on the bed. One hour later, both bodies wake up.
Since there was no continuity of experience, are "you" (whatever you think "you" means) still the original body?
Yep. I'm wherever the original body was moved to. I would not wake up and experience the bed on which the copy is located.
Nick, here's a series of situations for you to consider:
a) Man walks up with a gun and intends to shoot you in the head, no explanation offered. Do you defend yourself?
b) Man walks up with a gun and intends to shoot you in the head. He explains you have a perfect duplicate nearby, and only one of you can be legally allowed to exist at a time. Do you defend yourself?
c) Man walks up with an instantaneous disintegrator ray, and intends to vaporize you, no explanation offered. Do you defend yourself?
d) Man walks up with an instantaneous disintegrator ray, and intends to vaporize you. He explains you have a perfect duplicate nearby, and only one of you can be legally allowed to exist at a time. Do you defend yourself?
e) You walk into a booth marked 'transporter'. In front of you is a red button marked 'Start'. Around you are serrated blades, blender-style, that are clearly set to start grinding the moment you push the button. Death is likely to be rather messy and painful. Do you push the button?
f) You walk into a booth marked 'transporter'. Around you are several ballistic weapon muzzles, tracking your head and heart. In front of you is a red button marked 'Start', which is clearly going to cause the weapons to fire at you. Do you push the button?
g) You walk into a booth marked 'transporter'. Half of a pamphlet is in front of you, on a shelf next to the 'Start' button, which details how advanced laser scanning apparati will dissect you, atom by atom, over the course of 0.03 seconds, totally vaporising your body. Do you push the button?
h) You walk into a booth marked 'transporter'. There is a pamphlet in front of you, on a shelf next to the 'Start' button, which details how advanced laser scanning apparati will dissect you, atom by atom, over the course of 0.03 seconds, totally vaporising your body; while on Mars a similar apparatus assembles a perfect duplicate of you atom by atom from stock matter, creating a perfect duplicate and programming that duplicate with all your consciousness. Do you push the button?
In each case, I would answer either to defend myself, or not to push the button, because in either case, I'm about to wind up dead if I don't defend myself/do push the button. To me, each and every one of these examples is equivalent. Yet you've already said that you would defend your life in A, but push the button in H. What I'm wondering is, at what points do you value your life over this illusion of transport, and at what points the illusion overcomes your survival instinct.