Your way of thinking can e used by theists to impose "treatment" on atheists since this treatment would "help the 'sick' person live a happier, more fulfilling life." according to their point of view.

I would like to prefer only to treat ppl that are a threat to himself or others

dont think so. if in a course of 7 years all your cells are replaced by new ones, it says that you are a diferent person that the one 7 years ago? if you have a perfect copy of an object, how can you say who is the original and who is the copy? even if the original is still alive! My opinion is that memory dumping/uploading enables not only personal imortality but personal multiplexing too