IMO they have poor training. I don't know of any police ethics classes. Candidates go to a police academy, not to a college, and don't have to get a degree in criminal justice. They have no training in patience, mental health issues, or in deescalating conflicts (some police departments do this, but not the academies). The purpose of the police is to enforce respect for the law, and almost always they take this as meaning that they are the law, and you must respect them as if they were infallible. That is, their egos get in the way. Most of them are completely blind to this, as they have no training about it. They are also trained to shoot to kill, a terrible fault in the whole system. They do not take classes in how to eliminate bias in police work. Another problem is that the police unions are laws unto themselves, and protect bad cops until it is impossible to protect them any more. The system badly needs to be overhauled.