The “Big Lie.” Even Hitler was “open” about it - in positing that the “Big Lie” was Jews being responsible for Germany’s failure in WW1, he was asking his audience to accept a true “Big Lie.”

Allegiance to outright falsehood is about a marker of being of the right ideology. Political parties have always been like football teams to some of these folks - it’s about having the correct tribal markers and spouting the slogan. Words aren’t really supposed to mean anything - what they are communicating to everyone is “we want to invade Greenland.” They are signaling to their audience and just know that they can say whatever they want, while we scramble to respond to the words and not the meaning.