The option of modifying it to not dematerialize you, but copy you, is how this question stops being tautological. Imagine there's a "copy/move" mode switch. Is the act of switching it to "move" a decision to murder the "input you" (or commit suicide, if you're operating the device yourself)?
EDIT:
Downstream from that come the legal questions like, does the person leaving the transporter at the destination have rights to your identity, accounts, assets? Are they married to your spouse? Does this depend on whether the switch on transporter was on "move" or "copy" position? If so, why? And how does this square with ethics?