In an article that rises to the level of self-parody, a Washington Post journalist with the Dickensian name Simon Denyer turns a touching moment of triumph into a bit of an ordeal.  As most readers know, President Trump's granddaughter Arabella Kushner wowed an audience and the Chinese internet by singing three songs and reciting classical Chinese poetry.  Although shot with low production values (a home video, see?), the performance was expertly scripted to pull Chinese heartstrings, addressing the Chinese leader and his wife as "Uncle" and "Auntie," as is often done in Chinese culture when families are close.(I should note that young...