I grew up in Hong Kong, but the reality was that Hong Kong was eventually going to be re-absorbed into China, after the 50-years were up. Sure, we're a little ahead of the plan right now, but much like many countries, independence is extremely hard fought. Look at Catalonia in Spain, or the fact China still thinks they are in control of Taiwan.
On the subject of this national security law that was passed, and that many Western governments are crying foul over, how is this any different to the Patriot Act, passed after 9/11?