Actually I think that police culture was based on the radical thought that people should obey laws and if they don't they will be charged and face a judge who will pass a sentence on them.  However as we know, the police are pretty much powerless to charge anyone (racism you know even if the person is caught red handed stealing, beating whatever) and if they do then some judge will rewrite the law so that the charged individual walks away.   As for investigating any crime - good luck with that since you really are not allowed to.

Frankly I don't know why anyone that would consider being a police officer as a career - what would be the point of following this as a career and being subjected to second guessing by individuals sure as the individual who penned this article.