https://www.americanthinker.com/articles/2020/05/common_sense_and_selfevident_truth_in_a_posttruth_world.html
Convincing Americans that there is no such thing as truth defeats the very foundation of the American idea.
Many Americans today go far beyond simply rejecting the ideas of the American founders, the claims of the Declaration, and the Constitution. They reject the very idea of truth. These Americans were taught in American universities that there is no such thing as truth, that truth is an outmoded concept, that we now live in a post-truth reality. The belief that the concept of truth is outmoded is no longer confined to academia. It has invaded the world outside academia and won a great victory there; the Oxford Dictionaries selected “post-truth” as the Word of the Year for 2016.
And a great victory it is. Convincing Americans that there is no such thing as truth defeats the very foundation of the American idea. The Founders, famously, founded America on certain truths, truths they declared to the world were not only true, but self-evidently true: “We hold these truths to be self-evident…” Self-evident truth occupies the first place and also the highest position among the declarations of the Declaration of Independence. “Created equal” and “unalienable rights” and all the rest follow along after that bold opening claim.
The Founders certainly believed they built on the rock of self-evident truth. But if there is no such thing as truth, then there can be no such thing as a self-evident truth, and everything the Founders declared and established can simply be dismissed. There is no need to try to understand the thinking of the Founders — not even by professors of constitutional law.