Thanks for the descriptions of violence meted out by the police on a regular basis. I never see videos of cops doing the things you describe above, especially cops killing American citizens, because I'm a troglodyte. 
It does not at all surprise me that only a few dozen cops are ever actually convicted of police brutality since, although America is supposedly a nation of laws, they mainly are there to benefit white people who enjoy as special relationship with the power structure. Actually, sometimes I do get out of my cave and I have noticed that far too many cops commit all kinds of crimes, including  rape and murder--of suspects in their custody. 
I do not need you to tell me to obey the law or what (you hope) my treatment would be if I don't, since, as I already mentioned in my previous post, it is my habit to obey the law since I dislike and fear the police.