In the 1964 movie “Becket,” the title character tells Henry II that there are soldiers in the crowd of a reconquered French town to encourage their enthusiasm for the king’s procession upon entering the town. Dismayed, Henry asks his best friend and (at the time) Lord Chancellor, “Why must you destroy all my illusions?” to which Beckett responds, “Because you should have none.” Becket knew that if the king had illusions, he could make mistakes in judgment. Likewise, myths about the law can lead to mistakes in analysis and …