Actually Edit XYZ, in the much of the world assisted suicide is neither legal nor illegal, it's not on the books. And there are a few places, like Japan and Canada, where the law has it both ways, the law overlaps and conflicts. The real question is does Bajor have assisted suicide, DS9 (regardless who administers it) is Bajorian territory. What make you who you are is your personal identity, your knowledge of self. Nobody is saying that what used to be Kurn's mind was wiped completely clean, it retained the ability to walk and talk. What was removed was Kurn himself. Again, the medical procedure was done without Kurn's permission. Whoever it was that walked out of sickbay at the end of the episode, it wasn't Kurn.