@paninid This is because for decades most police departments have been hiring the EXACT wrong people to be police officers.

You shouldn't hire people to be police officers who are doing so because they feel weak, powerless, or inferior and believe that wearing a uniform will make them powerful. There are LOTS of people like this.

Well run police outfits (they do exist) make new officers spend several YEARS working, usually in the jails, to prove they are mentally fit before they are ever allowed into a patrol car to deal with the public. Those agencies know what they are dealing with and know that most people who want to be police officers are exactly the wrong people.