I agree, although it was careless of Palin, a very public figure, to provide factual info in her password backup question and answer. The feature is meant to allow you to regain access to your account if you forget your password. Yahoo and other websites don't care if the info is accurate or not. The "answer" could even be a string of keyboard nonsensical characters like in the original password.
keyboard nonsensical characters = nonsensical keyboard characters