Someone in the game is always at a disadvantage. The tribal switches, I think, are simulations of natural diasters. Noone can stop a crippling storm or a volcano eruption, which can ruin an empire. I mean, everything in Survivor is fair(except for the rule about not stealing the hii, that makes no sense whatsoever), so whatever happens is legitimate. I hate exile island, the hii, f3s and bloated casts on aesthetic grounds, not game grounds.