Acab is not about there being good cops that are drowned out by bad cops. Acab is that, by definition, all cops are bastards. There might be good people that become cops, but they either stop being cops or stop being good people, because it's a requirement of the job. Anyone who abides by the "thin blue line" to protect their corrupt buddies is by definition corrupt, and cops, by definition follow the thin blue line or they lose their badge.