Comment by germinalphrase

The role of law enforcement is rarely about direct intervention to stop criminal behavior (or in your example, violent bullying). They investigate and, potentially, punish criminal behavior that has happened in the past. They act as a deterrent to crime, but also to vigilante justice.

Conflict resolution provides the potential victim with agency to intervene in a situation on their own behalf. Of course, this doesn't preclude the option of calling the police. Why not expand someone's options for keeping safe?