Anon calls it the "comply or die" culture in modern policing. Officers are so insulated from the consequences of their own actions that they natively just become monsters.
Remove immunity and require escalated criminal prosecution for anyone who violates their oath of office or allows anyone else to for promotion or personal gain.
Even higher levels of punishment for Attorneys and Judges.
If we are to clean out this system, it must be through legal and transparent means. Lots of justice system members need to be in prison. LOTS.