the jury heard all of the facts and saw all of the video and determined that the police were culpable.
people in distress die at the hands of the police all the time. some have mental disorders, some are on drugs and some have bad behaviour. some are murderers. none of these individuals are to be executed by the police. they are to be dealt with by the legal system.
the police are liable if their actions kill someone and it was not in self defence.
what i will agree with you about though is that maybe none of the video should have been released to the public in order to ensure public order.