Blacks said they were going to attack the police. This is called follow through. Leave it alone and we will have our very own black al quaeda.
In this specific example, i.e., a classic bullshit marijuana arrest, I am 100% on the side of those Blacks who interfered with that arrest.
If the subject of the arrest had done something that called for police intervention, robbery, assault, etc., I would be on the side of the police. But I believe any cop who goes out of his way to arrest an adult for smoking a joint and bothering no one deserves to have the shit kicked out of him.