Comment by tsimionescu

Survivor is the opposite of how real human societies work - especially the tribal ones that thes show is aping. Real tribal societies are stable forever, and they are almost entirely related people (especially if we're talking about smaller tribes). You're reputation for helpfulness is crucial in any such society, so the kind of backroom dealing and betrayals the show is known for are almost entirely out of the question: if you are found out as a schemer, you don't get to go home to your real family, you risk being ostracized for the rest of your life.