AS DONALD TRUMP’S tariff tantrum destroyed trillions of dollars in shareholder value, shrieks of horror from American chief executives grew high-pitched. If you think America Inc had it bad, then spare a thought for Hong Kong. The self-governing Chinese territory is the world’s gateway to Asia, and China in particular. It is also Asia’s, and China’s, gateway to the world. And for the trade-warmonger-in-chief, China and Asia are enemies number one and two.