It is akin to the idiom “1 rotten apple spoils the bunch”. Even a ‘good cop’ covers for, or supports directly or indirectly bad ones. Their internal culture is manifestly rotten with an “us vs them” mentality.
Spends the day cursing being surrounded by criminals, at best trying to ignore racist jokes, and gets lucky nobody challenges their supreme authority so doesn’t get on the news: a good cop (for now)