If the HK police don't stop the rioters, sooner or later there will be other parties of rioters of opposite voices to come to the surface. Shall people support the rioters, against the police and end up with more and more riots? The police is professional. The rioters try to make them anger emotionally. The rioters are lucky because they are in HK. If they do this to the cop in US, they will see more violence/blood. It is very strange too. Why the people complain the police not the rioters who cause the chaotic situation? The people must be the rioters themselves. They have right to ask for what they want but be done peacefully not disturbing others' daily life. Also, not every request must be fulfilled. So, how the police treat the rioters are already gentle. It should be more tough.