Hong Kong is a part of China, and the people there should stop opposing the government. It will not benefit them.
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Well, that is for them to determine, I think. China should become less autocratic and allow for more freedom of speech and of the press. I don't think it is bad to protest to gain those freedoms, nor for us to support such protests and goals.
I do think they risk a re-enactment of the Tianamen Square protests 30 years ago. And that would be very unfortunate.