I really try not to blame people for things outside of their experience. I.e. if you've grown up and the police have always had your back, and have "been on your side", then I'm not surprised that you believe cops to generally be on the side of justice, and don't blame you if you buy the party line that the police are your friends.
A lot of these people, through the vagaries of birth and fortune, probably have no reason not to have confidence in the police. They do not belong to a population regarded by the police as "the enemy", and are more likely than not have been the recipients of the benefit of the doubt in past interactions with the police.
So, I wouldn't call them "assholes" per se, just perhaps people that haven't been exposed to the whole picture.