But I think I see where you problem is. What you listed were opinion (granted, very common nutball opinion) and not fact.
I am entitled to mine.
It seems to me, the the only times LE is ever convicted of excessive force is when there is some passer-by with a video camera (Rodney King), or when someone with either a tremendous amount of money, or a contingent claim worth millions (Randy Weaver) is victimized.
I am not willing to believe that the only times LE ever uses excessive force just happens to be when one of these highly unlikely conditions is met. This in turn, means that every incident in which a citizen is injured or killed is suspect, especially when there will be no intense scrutiny of the exact circumstances.
How do you explain the recent incident near Baltimore when FBI agent Braga managed to shoot a completely innocent kid in the face, maiming him for life, and then escaped without any discipline? Or possibly you don't remember that one?
How about the family whose dog was shot by the highway patrol after they had begged to close the casr door and were not allowed to? Their crime? Well, the father accidently left his wallet on the car roof & someone saw it blow off. Somehow the dispatcher was convinced that this was some kind of new robery technique, where the perps threw money out of their car. I know, memory failure again.
What law enforcement organization do you work, for?