I don't disagree with that, which is why I think Beijing needs to scrap 1C2S.
That, my friend, is a WHOLE OTHER ISSUE.
1C2S is a huge framework. You can't just scrap it, like you can scrap a small project. A society is a extremely large and complex multivariate mechanism. You can't just lightly say "just scrap it", and it get magically done without any preparation.
Before we can "Scrap 1C2S", we need to first come up with a mechanism that can run the society first. That is rather difficult, if not impossible without a least a few years of preparation. The central government is not prepared to directly run Hong Kong now, because it hasn't planned on doing that for now. This is why the central government repeatedly stresses their faith in 1C2S. If the central government steps into Hong Kong unprepared to run it, it will result in a less orderly Hong Kong. How is this a good thing?
The central government is not worried about Hong Kong what so ever, because they have already decided to put their faith in 1C2S. That means they have put their faith in the HK government. This means HK government still runs HK however things goes. The PAP is prepared to go in, as soon as the HK police and public security systems become overloaded and unable to maintain order anymore. The PAP will go in, quickly disperse the crowds, subdue rioters, restore order, and hand over captured personnel over to the HK police department. In the mean time, they will most likely re-equip the HK police, re-enforce them with better and more powerful equipment, and give them a breathing time to recruit more personnel and take a break. Once the HK police is recovered, they will hand over responsibility back to the HK police.