i dont think the whole "defund the police" thing means you have literally no law enforcement and just the wild west with the "community" protecting itself, but rather a reimagining of what the police should be responsible for.
police departments in big cities rightfully complain that they are being asked to solve too many of society's problems. in addition to blue collar crime, they are tasked with dealing with homeless situations, opioid crises, cyber crime, domestic disputes, mental health issues (LA County Jail is the largest mental health ins ution in the country). the idea is to slash funding but also responsibility, and re-allocating much of the funding towards social services meant to address those underlying issues, and more of an emphasis on community policing (ie people actually patrolling communities they are familiar with).
Camden NJ dismantled their entire police department in 2012 and rebuilt it from the ground up, with more emphasis on foot patrols, to great results.