Why is the police department the one working to make the police department obsolete? That seems like mistake number one if we're going to try to demilitarize the police.
Police only exist in a complex enough form of social consequence worth arguing about, where people don't have the material and mental means to comfortably enjoy life.
Concepts such as law, order and defence are topics that readily devolve - precisely because of widespread mental deficiency - into counter-productivity.
The base useful question we can ask as a species supposedly seeking peace, is how to best cultivate the material and mental means that demonstrably create it in us.