Great Britain gave HK back to China. They can do with it as they please - unfortunately I don't see how the protesters can come out on the right side of this without a revolution.
Thought experiment: if say Rhode Island had a Muslim majority and they voted themselves Sharia law in violation of federal articles, how cavalier would the federal government / the rest of the populous be in tolerating this?
"They can do with it as they please"... what? The tyrannical CCP has some sort of fundamental ownership right over the lives the people of HK? Your statement about sharia law in Rhode Island not only confirms that you don't care about the will of the people in the democratic sense (which, in your thought experiment, are mostly muslims, and you imply actually do want religiously based laws), but also reverses the reasoning of constitutional rules (which are there by the will of the people, to specifically to bar restrictions on free exercise of religion, with the express purpose of protecting the minority of Rhode Islanders who would be oppressed by Islamic law that was enacted by the will of the majority). That you think this example supports the former is gobsmacking to me.