I don’t think we do.
If it wasn’t for the police, not only wouldn’t we be safe in our homes but also preys to predators. If police didn’t exist, groups and organizations of people will create their own government. Not exactly good, reasons in my eyes are not only would it lead to Anarchy, where people would basically go ballistic and needy for food, protection, supplies and etc. But the fact that people would form different gangs and territorial defenses. More lives would be lost than won. Resources would eventually become scarce, and no order would seize to exist.