Truth is the only stable organizational principle.
It is the equivalent of “nature” in the realm of ideas, in so far as “nature” can be defined as what selects for survival and reproduction of biological entities.
The truth is what can be arrived at by differed peoples across time and space, and that does not change according to the beliefs of the preceptor.
“But matter itself is directly affected by measurement at the quantum level!”
Indeed, but isn’t that statement itself an expression of conclusions based on repeatable, measurable phenomena? Isn’t our understanding of quantum mechanics still contingent on Truth, even if only as a measure of contrast?
We are disinclined to place importance on objective truth to the exact degree that such a value system would erode our current mode of existence.
The Truth is destructive of all that does not adhere to it. Perhaps a healthy fear of tyranny is what averts our eyes from those facts and phenomena that would cause us pain and direct us to change.
So often, our relationship to the world is rendered toxic by a pathological definition of truth:
That Truth is whatever our individual mind possesses.
Such a definition is so flimsy that it either makes our behavior disorganized and chaotic or else our identities so rigid that we stagnate because any change would imply our previous presumption of the Truth was completely false, and thus contradict the very principle our definition of Truth is founded upon.
The Truth is not something you inflict on other people. If it must be inflicted, enforced, propagandized, it is likely not the truth.
Because if it were true, why would force be required to make it manifest in the world?