A study led by veteran pollster Robert Chung says the months-long anti-extradition movement is not just about Hong Kong people protesting against a bill and their government - it's also a clash of values between liberalism and mainland-style paternalism. In order to look into the causes and effects of the social unrest, the Public Opinion Research Institute surveyed more than 1,000 people between July and October. Its final report concludes that at the heart of the movement is people's fear of the gradual erosion of their freedoms. Annemarie Evans asked Dr Robert Chung, the head of the Institute, to tell us more.