To preserve the sense and humane treatment. Instead of telling the truth, that the audience would not get away. Sometimes, lying in this manner is said to encourage the other party.
In order to nurture and maintain a sense of good will. Instead of telling the truth that he believed that the audience is not. Sometimes, lying in this manner is said to have discouraged the other end.
to care for your feelings and maintain a reward instead of a will tell you the truth, I believe that the audience would not be allowed to go out some time to lie in this manner is said to cheer.