This is very sad to see. I lived in Hong Kong in 2011-2012 and you could already see the tension whenever "mainlanders" came over, bought suitcases, then filled them up on luxury shopping trips. A lot of the spirit I saw from the people of HK seemed similar to that of Americans: fiercely independent, very entrepreneurial, and believed that things kept getting better.
Where is it slipping away to? The US itself now treats Hong Kong just like any other Chinese city.
Hong Kong is just yet another Chinese city.
Before, people had freedom and an expection of fair treatment. It's been steadily degraded, recently with the kidnapping of people from HK to bring them to China.