Who gets to decide for everyone else what the "obvious truth" is and what the "dumb ideologically driven belief" is? If the truth or falsity of some point is in

Who gets to decide for everyone else what the "obvious truth" is and what the "dumb ideologically driven belief" is? If the truth or falsity of some point is in contention, then the way to resolve the disagreement is to allow all sides to argue and justify their position. Of course this system doesn't always come up with the right answer, but no magical infallible truth-determining oracle exists, so we do the best we can.