Hong Kong has been an entrepreneurial entrepot to China for more than a century. Freedom of thought, freedom of speech and security from repression by bureaucrats, corporations and organized crime are necessary for individuals to develop and present new ideas to the marketplace of ideas that is the driving force behind free enterprise in a demographically heavily populated world. China is not being useful in exerting jack-booted organized crime force upon the citizens of Hong Kong that have for several months been protesting onerous legal measures from the Communist government that would undermine personal and social liberty.
China has nothing to fear from the small population (comparatively) of Hong Kong having more civil liberty to determine their own economic, personal and spiritual life preferences than those of the vast mainland realm of the Middle Commundom. Instead of looking backward to the past history of imperial subjugation of the masses and fearing warlords or worrying about Marxist concerns of a commercial class oppressing the rights and well being of the communist, Chinese leaders should be more forward looking and support civil liberties for Hong Kong with the hope that a glasnost and perestroika evolution could germinate and flow forward with better ideas and efficiencies for the challenges of the mainland economic and social situation.
Marxism was not the end of economic evolution nor the final state of the philosophy of government. It is wrong for political theorists to mire themselves in the past instead of improving real conditions for the people presently. Goals of any government should be modest egalitarianism with a fair distribution of opportunities for building wealth, creation and ownership of productive ideas, security and well being of all citizens and so forth. The people should not be oppressed or repressed by onerous bureaucrats nor corrupt, wealthy and powerful elites who control political destiny to benefit themselves and a fractional minority foremost.
China could learn from the successes and failures of the Soviet and Russian post-cold war evolution and build and infrastructure a priori for letting a normalized liberalization occur in China. It would need to set laws that would limit the amount of wealth any individual could have as a percent of the national income and create progressive tax laws to assure that concentrated wealth does not lead to concentrated power that leads to oligarchy or tyranny.
Western responses to Russia following up the end of the Cold War have tended toward being self-serving more than mutually beneficial and practical thereby limiting the potential for bi-lateral progress in addressing the host of environmental and economic challenges the entire world unavoidably experiences and need to deal with. China can create transitional and lasting foundations for a transition toward as free of a society as possible for individuals within the real paradigm of demographic, social and security challenges. The freedom of Hing Kong as an associate entity within the Chinese mainland society is not any sort of threat to Chinese state security.