[Tom4784]

Short term, the police needs to show condemnation for the killer cops. It makes them look bad when these killers are protected by the system which is unfair since most officers are likely very good at their jobs, it's a small number of bastards that ruins it for all of them.
As it stands Police officers cannot complain about distrust and open hatred from the public if they aren't willing to take a stand against these killers.

Long term, better training and a tougher screening process are needed. These killers should have never been given a gun and a badge in the first place if they are going to lose their heads and murder people as a first response.