Police need to visit schools to talk to the kids about the way they should act toward the police. At the same time, the police could talk to the kids about the many things that they do to help the public in a days work, such as going to 911 calls to accompany ambulances during medical emergencies.
Sure there are some bad cops, just as there are some bad nurses or teachers who should have never chosen these professions. Unfortunately these make the reputation for all bad. Only education and information to the students can change that. Also parents and teachers and the police must work together not against each other