I don't have a memo proving it, but I believe many large departments encourage this negative attitude. I could never be a cop. I don't like having arbitrary authority over people. It's embarrassing and scary. It's amazing to think that one lying cop could ruin someone. A cop can bring the entire weight of a state against you if he feels like it. Yeah, I may win in the end if I haven't done anything wrong, but at what cost?
Departments should give authority to people with high intelligence, good character, and excellent leadership qualities. In any voluntary association, some will come out as natural leaders; people will follow them willingly because of their competence or character. Such people should be peace officers and there should necessarily be few of them because there should be relatively few laws to enforce. For these and other reasons, communities should be suspicious of 18-29 year old cops. We seem to have a lot of young cops. I think the regime likes young cops because younger people will often behave arrogantly.