If people don't have a soul, it still is a problem, because you are still killing a person. Why should I care that my exact clone will be living my life, if I'l

If people don't have a soul, it still is a problem, because you are still killing a person. Why should I care that my exact clone will be living my life, if I'll be vaporized? And consider another scenario, as described in "Into the Silent Land" - what if there's a malfunction and the clone is created, but I am not immediately destroyed - should I then voluntarily agree to be killed just to make sure there's only one of myself?