Hi, I’m a naturalistic determinist atheist. I won’t be taking a teleporter. The problem is that my body (which my continuous conscious experience resides in) will get erased if I do.

Replace “dismantled by the teleporter” with “shot in the head,” and it might make it a bit more obvious why it matters that the original you dies. I wouldn’t want to be shot in the head, even if I knew there was a perfect facsimile of me being constructed the moment the bullet entered my brain. The fact that this me would die makes intuitive sense to me.