What about when suspects or perps use a "loophole" to escape justice and then you find out that loophole was the accused weren't read their rights or was abused during an interrogation and had no access to a lawyer. Like the cops didn't do basic police work correctly but it's the suspect who did something wrong. Remember that the rights read to a person under arrest are actual constitutional rights that each American is entitled to and which the police must abide.

Copaganda is real.

There was a Canadian TV show called Corner Gas.

In one of the episodes, the towns police force (two cops) has a real or precived grievance, and decided to work to rule on protest.

By the third act they've discovered that work to rule is more work than they've been doing, the grievance is dropped, and nothing has changed for the next episode.

Mysteries do a lot better than procedurals, because being wrong is intrinsic to the format. The cops on Midsummer are still The Good Guys™ and always get the right person eventually, because a whodunit with no clear answer would be a different genre, but there's ample screen time for a lot of people who are understandably not fond of them.