Today they are setting up the police force to do that function.

Who Polices the Police? - The Fifth Estate

To Serve and Protect, but the question that needs to be asked is who are they serving and protecting?

This is not a mystery, the police purposefully screen for and select people with psychopathic tendencies.

“For example Police. Police academy had something called the MMPI, it’s the Minneapolis Multiphase Personality Inventory, it’s about 600 questions that determines the range of your personality, it’s actually quite accurate. One of the things is psychopathy scale, so they can tell by this test pretty much, what your psychopathic tendencies are. Now police academies give this to new recruits, you would think to weed out the psychopaths, but no it’s not, it’s to weed them in.”
https://anonup.com/thread/7301091

https://www.youtube.com/watch?v=MiIa3d_I5fM