Public safety is largely about social conditions and the extent to which people feel secure, not only in their own homes but in their communities in terms of housing and healthcare and education, food supply. If those things are all taken care of, you don't need policing as much as you would otherwise.
The City — Five Days Without Cops: Could Brooklyn Policing Experiment be a ‘Model for the Future’?
Jeffrey Butts, who has done extensive research on cure-violence initiatives, also questioned how far the experiment could go.