Ian Walsh makes an obvious point, but it seems a lot of people, even many radicals, never get it: the justice system is not your friend.
Police and corrections officers are paid not just in money but in license to brutalize. In most cases, they can get away with beating people up and even killing them. To stop a police officer from skating on murder requires riots, as a rule, and even that doesn’t usually work. The FBI has cleared themselves of every killing an FBI officer has performed for decades.
This is not incidental, this is not an accident; this is how our lords and rulers want the enforcement system to run.
Police are selected and trained and socialized to either become thugs or to cover up thuggery. Imbeciles will say things like “not all cops,” but it is virtually unheard of for the “good cops” to inform on the bad cops–they keep their mouths shut. This is wise on their part, of course, because the vast majority of police would turn on them in seconds if they were to betray the blue wall of silence.