Bejing and HK gov't know exactly who behind these incidents. The thing is HK have not passed an Article 23, a law that design to against those problems, also HK have no party laws and laws that restricted on NGO. That's why many pan-democratic members get free from the bribery charges and NGOs are everywhere to misdirect HK public opinion. To tell you the truth, HK is going to have a very hard time, since we are now the battlefront of the Sino-US cold war. One thing I could tell, this time HK gov't will not back down that extradition treaty will be passed, and an Article 23 is on th way. Yet HK will be doomed since US will have counter measurement but this once for all to clean up HK and prepare to fully intergrat HK into China in the future.