if i see this correctly, police are a private security force acting on behalf of a corporate office of the country. they act on behalf of the office, but they are fully responsible for their own unjust/unlawful behavior unless they get forgiven by the corporation (their own buddies).

the people higher up in the office are not responsible for the violence, because they are never the ones who carry out the violence. they're still psychopaths, but they manage to abstract the violence from their own spiritual account.

constable is a more lawful appointment, but it's still not great. the line "I will, to the best of my power, cause the peace to be kept and preserved and prevent all offences against people and property" should be sufficient...