Quote from article at link below:

"But let’s say these ultra-progressive municipal governments could get their wish and abolish the police in their cities entirely.  What would happen?  Inevitably, an armed group would emerge and impose a monopoly on the use of force.

If you want an idea of how that works, look to our southern neighbor, Mexico, where over the past decade endemically corrupt police departments in some areas have been supplanted by autodefensas, or local self-defense militias. But before you get too excited about the prospect of paramilitary autodefensas policing American cities, understand that in Mexico these groups are a mixed bag at best—and at worst they’re not much better than the corrupt local police and cartel gunmen they replaced. More importantly, their mere presence in Mexico was and is a disturbing sign of societal decay."

https://thefederalist.com/2020/06/09/if-you-want-to-know-what-disbanding-the-police-looks-like-look-at-mexico/