God bless you for sharing this quandry, dear YHAOS. I imagine that at least some of the people who have difficulty answering your challenge may have a serious "truth problem."
But I imagine I shouldn't be so hasty. The wise course is to wait to hear what the person(s) you address have to say about the matter.
I also imagine that if they will to answer the question you pose in good faith, they'd find they first need a standard, a criterion of truth and judgment that is not their own "creation." Otherwise, there is no common ground in truth according to which society can give its just assent.
Thank you for your beautiful and perceptive post, YHAOS.
Well, it seems your wait is over, that you have your answer, and that your judgment is not at all hasty.
"I also imagine that if they will to answer the question you pose in good faith, they'd find they first need a standard, a criterion of truth and judgment that is not their own "creation." Otherwise, there is no common ground in truth according to which society can give its just assent."
And so it would seem that even an ordered 'polis' is limited (may we even say crippled) if that 'order' is but one dimensional.