"There is, certainly, an unbreachable chasm between the subjective and objective world. A reasonable person expects subjective facts to be overturned, because subjective facts are not facts; they're just well-considered opinions, held by multiple people at the same time. Whenever the fragility of those beliefs is applied to a specific example, people bristle--if someone says, "It's possible that Abraham Lincoln won't always be considered a great president," every presidential scholar scoffs. But if you remove the specificity and ask, "Is it possible that someone currently viewed as a historically great president will have that view reversed by future generations?" any smart person will agree that such a scenario is not only plausible but inevitable. In other words, everyone concedes we have the potential to be subjectively wrong about anything, as long as we don't explicitly name whatever that something is."