I don't know how that's relevant to anything I said. My point is about culture. Nonviolent protest requires you to be protesting an amenable authority. There have been plenty of examples in history of authorities that will just spill as much blood as it takes. To my eye, the only constraint on China doing that is their fear that people might stop paying into their economy.
Bear in mind that if China decided to roll into Hong Kong and simply kill everybody there, it would only increase the current Chinese government's death toll against their own people by somewhere between 16% to 40%. It wouldn't even double it! This is the government that brought you the "Great Leap Forward" in which they killed 18-45 million of their own people. This is a government being credibly accused of engaging in ethnic cleansing.
Are you sure advising "nonviolent protest" against that is a good idea?
"one of the bet they have to make is that the international community would not sit idlely while many HKers get killed."
That is not something I'd advise anyone to bet their lives on.