I was specifically talking about forwards time travel to distinguish between someone's mind existing in the world and them being alive as two separate states. In teh backwards timetravel example, what makes them different people? I would say legally they are the same person, and the same ethics and morals apply to them, and many people who know the version of them in the past would probably recognize them as the person they know albeit a bit different. Are you not the same person you were yesterday? Or a minute ago?