What parts of the world are you referring to? In general if you have people with automatic weapons attacking the police, you are basically in a civil war and th

What parts of the world are you referring to? In general if you have people with automatic weapons attacking the police, you are basically in a civil war and the army takes over. The police is supposed to be a numerous local presence, not a fighting force. When police has been equipped with automatic weapons, things usually end badly, particularly in those other parts of the world where police pay is nothing and alternative sources of revenue are very tempting when you are armed like a soldier. Having a corrupt cop is a thing, but a corrupt military armed cop is even worse.