Bertrand de Jouvenel's thesis in the penultimate chapter, “The Manners of Politics,” in his Pure Theory of Politics:
Political manners are necessary to prevent the conflict inherent in political life from escalating into full-scale civil strife.
Indeed, the introduction of brutish manners is a sure way for a politician to be shown the exit door.
TRUMP'S BRUTISH MANNERS ARE AN UNDERREPORTED FACTOR THAT LED TO THE WIPEOUT OF THE REPUBLICANS IN THE U.S. MIDTERM ELECTIONS.