We still do not know where the urge for truth comes from; for as yet we have heard only of the obligation imposed by society that it should exist: to be truthful means using the customary metaphors—in moral terms: the obligation to lie according to a fixed convention, to lie herd-like in a style obligatory for all. Now man of course forgets that this is the way things stand for him. Thus he lies in the manner indicated, unconsciously and in accordance with habits which are centuries' old; and precisely by means of this unconsciousness and forgetfulness he arrives at his sense of truth.
Nietzsche.
On Truth and Lie in an Extra-Moral Sense https://web.archive.org/web/20180625190456/http://oregonstat...
Truth is just a tool that helps you make good predictions. It's increasingly clear that this is all intelligence amounts to: a constant cycle of prediction and error correction with the goal of maximizing reproductive fitness in humans or minimizing a loss function in machines.
One serious problem we're facing lately is that truth is not always predictive of how systems controlled by bad-faith actors will behave and evolve. We live in a post-truth era, made possible by social networking and information technologies in general. It's not enough to "lie according to a fixed convention," as there are now multiple competing conventions.
This was always the case to some extent, but these days the impedance mismatch between truth and consequences is a target for zero-sum arbitrage. The truth won't set you free if you join the wrong cult; it's more likely to bankrupt you or worse.
We are so deep in the Simulacrum regarding the complexity of our systems we could be well past the point where extinction is inevitable before we even notice it's a possibility.