When one is polite in German, one lies.
JOHANN WOLFGANG VON GOETHE, Faust: Part II
Literally, in that case Devil's doctrine.
I wrote a post yesterday on exactly this, how society is inherently dishonest, favouring comforting lies over uncomfortably fact, feelings over reality and inventing polite euphemism such as tact and diplomacy for blatant falsehoods intended to placate monster by stroking their ego's.