The Lang Kwai Fong incident was horrific but the system the police imposed has made the area a nightmare to go into on any festival nights. I am sure there is a better way to do this. Perhaps an entry fee and quota for the number of people entering. As to skating on the streets I have only once been stopped by a policeman who suggested I should be skating on the crowded pavement rather than the street. I tried without success to explain that I would be traveling faster than most people on bicycles but he would not be swayed.
The problem with Hong Kong is that rules are made without a lot of thought. Did you know that officially you are not permitted to skate on cycle paths?
What is even worse is you cannot skate in parks. We must be one of the only cities in the world where you are actively discouraged from doing any physical exercise apart from Tai Chi in public recreational facilities.
If anyone is interested in skating for exercise, the inline hockey rink in Jordan is open for free skating every Friday from 6:00pm to 8:00pm free of charge.