MIN READAug 13, 2019 | 01:09 GMT

Tourists look at the information panel that shows all flights are canceled at Hong Kong International Airport during a demonstration on Aug. 12, 2019, in Hong Kong, China.

(Anthony Kwan/Getty Images)

With Beijing and Hong Kong refusing to yield to protesters' demands and Hong Kong police proving incapable of restoring calm so far, no resolution is on the horizon. And this raises questions about just what would induce the mainland government to intervene directly in the special administrative region....