Because they put all their money and energy into their foreign policy (mostly messing up other countries) and pay very little attention to their domestic/social issues.
Colored people must unite. I say let the 'Hong Kong virus' spreads to every city in America. America has its work cuts out for itself, they don't have the time to mess with other countries and that's good for the rest of the world.
Those hk THUGS are running scare now! The only way to save their hide is to run to the UK and US in droves. Then again these THUGS would be beaten up by the white people in those countries but that's the story for the future.
I wonder what would happen if US cops were to swap places with HK cops. Those real THUGS in hk would have been squashed like roaches and their scrawny bodies would be pumped full of bullets.