I don't think we can consider "police" as a single institution, or in isolation. The character of the police in a particular locality depends on the local government of that locality. If the police are corrupt, it is because the local government is corrupt. That is going to vary widely from locality to locality, and fixing it cannot be a matter of simply changing the police alone; it has to be a matter of changing the local government.
I don't think we can consider "police" as a single institution, or in isolation. The character of the police in a particular locality depends on the local government of that locality. If the police are corrupt, it is because the local government is corrupt. That is going to vary widely from locality to locality, and fixing it cannot be a matter of simply changing the police alone; it has to be a matter of changing the local government.