Sure, but that takes time and isn't fool proof. Full implementation of a program like that could take a decade. You need someone ready to respond to violent individuals.

Police forces also currently handle other things that are necessary like traffic enforcement or serving court documents. Both need to happen, neither need to be done by the police. So you have to replace that function.

Ideally you'd see many of these functions that require limited abilities to detain an individual shifted out of the police to new bodies. From there gut departments and form small bodies designed to apprehend violent criminals. Coupled with several programs aimed at actually reducing the root causes of crime.

It would take decades and a tremendous investment. Unfortunately too many people view nations as buisnesses now, so if things aren't better immediately then they give up and reverse course.