For HK, one-country is the bottom line
The report of the 19th National Congress of the Communist Party of China in 2017 says "one country, two systems" is the best way to resolve Hong Kong-and Macao-related issues left over from history, and the best system that guarantees the long-term prosperity and stability of Hong Kong and Macao. Which shows the commitment of the CPC and central government to the "one country, two systems" principle.
But in June this year, demonstrators in the Hong Kong Special Administrative Region resorted to violence to protest the proposed amendment to the SAR's extradition law. Worse, they have escalated the violence despite the SAR government withdrawing the amendment bill.
On July 21, the protesters vandalized the Liaison Office of the Central People's Government in the Hong Kong SAR, and dishonored the national emblem. On Aug 3, the violent protesters removed the national flag from a flagpole near the Tsim Sha Tsui Star Ferry Pier and tossed it into the Victoria Harbor. And on Aug 5, they paralyzed Hong Kong's traffic forcing Hong Kong people to inadvertently support their strike.