I doubt it is an issue so much as a major part of their design. They are intended to be models of 'correct' behavior; that includes, I would assume, acceptance of any and all changes to the base data of the town. We, too, are expected to assume that we have always lived here and that the never-ending cycle of new arrivals always has as well, but unlike them, our base data does not immediately change. We register that the family we wake up with has changed in the event of a new member. In that respect, I believe their brains are not like ours in the way you describe: they are reprogrammable machines. We are still our flawed human selves.