I am totally cynical about the police. One of my nephew's friends gave up after training because he was so disgusted by the sexist, racist, homophobic and snobbish 'canteen culture'. He said the women recruits were subjected to crude remarks and the one Asian was given all the worst jobs to do.
This is not new, of course. My brother-in-law had a scrap metal yard in the 1970s and received a visit from the local CID sergeant every month, who demanded a bribe to stop the yard being 'turned over' again and again.
Hillsborough and the murder of Stephen Lawrence just confirmed my opinion.
It must be very hard for those officers who are honest and unbiased. I know that they would risk being ostracised or worse if they blew the whistle on certain practices. (Of course, this is true of NHS staff too).