A foolish consistency is the hobgoblin of little minds. (Ralph Waldo Emerson, 19th century poet)
This oft-quoted axiom has been argued by many thinkers. It is true that if you hold to an erroneous view, continuing to support it makes you look foolish, if not completely ignorant. On the other hand, what may appear to some to be foolish might indeed be a newly discovered truth or a new perspective on ideas that have to be looked at with openness.
You simple people, use good judgment. You foolish people, show some understanding. (Proverbs 8:5)