police shoot outs, and a truth revealing video.

why don't cops show this video in the far more common practice of "eyewitness" testimony? Police and prosecutors use eyewitness testimony exclusively in many cases they are seeking convictions. Yet they do not apply the same standard as when their own actions are called into question.
Why is that?

when ever video is available it is used to defend the officers. however many times it is twisted. if you look at the latest incident where in L.A. you see a officer strike a suspect on the face. well the media has twisted this incident . if a person looks closely you will see the suspect is grabbing the officers arm and pulling in trying to get free. this is before the officer strikes him. also the 2nd officer in near the suspect legs and i believe in on the radio calling for assistance. In this case the officers have been cleared of any wrong doing but the media is continuing to make a issue out of nothing.
often we have a video that does not show the entire truth , like the 2nd of the 3 videos i posted. however the 3rd video is more accurate.