There will always be police in cities. The nature of cities is to concentrate the worst human tendencies in an annonymous environment where there would be otherwise be no accountability. Meanwhile, at least in America, there are virtually no police in the countryside (where crime is 2-3x less per 1000 people), yet people have lived peacefully next to each other for generations. And where there are police (county sheriff's depts), they tend to be deferential and respectful of liberty.