Cops will not uphold their oath for the most part, and probably 98% will turn a blind eye when they know corruption is on-going within their own departments or any department they "cooperate" with at any time.
That's neither "anti-cop" nor "pro cop". That's simply a statement of fact. It's like saying "poison gas is dangerous". It's a factual statement. Getting the paycheck is ALWAYS more important then up-holding their oath for at least 98% of them at every level, and the higher those levels go the larger their paychecks get, so of course the higher-ups have more to loose by not going along with the corruption.