Yes and guilty people get off because of who or what they are, the cops must be telling the truth unless they're the one recently who when asked what are you going to charge me with said I'll make something up, where is justice then ?.
If a juror has seen the video they'll go in to the courtroom with a preconceived opinion. The judge will tell them to forget everything they've seen or heard, but they won't. I certainly wouldn't.
Unless you have inside knowledge of the cases you allude to and for all I know plucked out of thin air you have no idea if they were guilty or not, Cops in Court are cross examined rigorously when giving evidence, just the same as other witnesses its is the Jurors job to judge them on how they came across in the box which ones they believed was telling the truth
One thick Cop made that stupid comment and you appear to think that means all other cops are the same, that is lot even logical
Then you make a sweeping statement about due to one stupid Cop all of Cops must be the same a sweeping stereotyping a wrong assumption guess
It appears you have no knowledge at all about how a Criminal Court works with in cases such as this Jury members are selected not just the first 12 to turn up, in high profile such as this asked by the Defence and Court what they have seen on the TV read in the media and how they feel.
Some will rejected some will be selected , and yes a Judge will tell all Juries to listen to all the evidence carefully as their job is to make a judgement on the evidence , not what is on line or in the media but what happens in Court.