Five days ago was the National Day of People Republic of China, there were flags rising on the Tiananmen Square and citizens in China were all celebrating while the Hong Kong people, mainly students, were running the huge revolution for the pro-democracy election. Chinese government wants to solve the Hong Kong revolution safely because Hong Kong provides China unique and vital economy benefits that may cause a significant economy decrease if China loses it.
(Picture from http://www.thestar.com/content/dam/thestar/news/world/2014/10/04/hong_kong_protests_and_the_echoes_of_tiananmen_burman/heart_hk.jpg.size.xxlarge.letterbox.jpg)
This Hong Kong revolution is much like the Tiananmen student revolution that happened in 1989 when the government used tank to killed millions of students in Tiananmen in order to crackdown the revolution. However, the most shocking part of the Hong Kong revolution and the Tiananmen revolution years ago is the government hid this event from the Mainland Chinese people. There are news and photos post on Chinese news website but those news are mainly talked about how some people in Hong Kong support the Chinese government and called the revolution as an illegal meeting.
I believe the reason why Chinese government hid the news from Mainland people is they do not want to cause chaos in Mainland, too. But, people have the right to know the truth instead of fake news.