Of course police should be supported. Whether it's the US police or HK police. Imagine the difficulty of HK police dealing with so many angry kids on the street. Not an easy job. But in emotionally charged situations errors can be made and they do happen, everywhere in the world. And it's happening way more frequently in the US than in HK. You can be sure every incident of so called police brutality in HK will be broadcasted all over the world, making people biased against HK police intentionally.