I'd argue that the two are mutually exclusive bc cops are fiercely protective of the power that they have (ex. The time the police went on strike bc greater oversight was on the table) and a lot of what it would take to prevent crime would mean, at the very least, a large-scale reallocation of resources from police to a variety of other needed public services (like housing, mental health, education/extra cirricular activities for kids). At least, if the goal is prevention of crime and rehabilitation after the fact, as opposed to just outright punishment, which the cops are quite well-equipped to do