just read about the 1919 Seattle General Strike and it proved a police force is completely unnecessary, debunked that people wouldn't do anything if they didn't get paid (the FD and garbage workers still did their jobs! as did other workers!) and that life in the city dramatically improved before it got crushed.

Oh, we have an article about that:

https://www.socialistalternative.org/2017/08/20/workers-ran-seattle-lessons-1919-general-strike/