To add, I don't know much about Hong Kong, but it's pretty difficult to leave Turkey if you're a citizen, not many countries want to give you a Visa meaning only the educated, upper class, is able to leave. If you're proposing a solution you should propose one which doesn't leave behind all the poor.
This is exactly why my father-in-law sent all 5 of his kids to the US for college. All 5 now have US passports and can leave Hong Kong if and when it becomes worse than they can stand. So far, 2 of them have made the move.
Good luck with immigration. Britain certainly didn't want to let many of its former subject leave.
As an aside, the United States alone has brought in more than 7 million immigrants from all over the world, in just the past decade.
If you were concerned about being governed by Communists, you had 13 years to get the hell out. And if you weren't concerned about being governed by Communists...well, you clearly hadn't been paying attention to history. Tiananmen Square (1989) alone should have been a wake-up call to China's future subjects.
This doesn't make what's happening now less appalling, but HK residents had ample opportunity to avoid the inevitable. Compare that to other dictatorships that sprung up relatively overnight; in Turkey, for instance, Erdogan has been president for little more than 2 years.