The answer should be obvious - they're not "coming" from any of those places (as we hold to them) at all. The only rule they hold to is Protagoras' axiom "Man Is The Measure Of All Things" - where the individual human being, rather than God or an unchanging moral law, is the ultimate source of truth, logic, ethics, and meaning.
And sophistry is the measure of all language.
Haven't you heard? Man is now bad. Now it's Nature or the Earth Mother that is the measure of all things.
"Humanists" now advocate animal rights and voluntary human extinction.