This is the problem - I don’t literally think all cops are bastards, but unfortunately enough are, and the organisation is so rotten and institutionally misogynist and racist, that it makes no difference.
Look at Cressida Dick and Jean Charles de Menezes. That should have been career ending. Any of us could have been murdered in cold blood on a tube train, simply for living in the same block of flats as a terror suspect, and there were no repercussions for anyone involved in that operation whatsoever.