Sin has no courage to stand alone. Right has the courage to stand alone. But man does not want to be isolated in his rebellion against God. He can always quote impressive names in support of his actions and ideas. Brilliant thinkers agree with him.
Successful people share the same opinion.
Why, even Joab - you can not question his mettle. A priest, a churchman, nothing less. So people want to deny some aspect of God's truth. They find justification for their denial and for their sinful course of action in setting aside the Word of God, by finding someone in high position who will agree with them. Perhaps they find a sermon or an opinion or something else which agrees with their own proud course of action.