I as a general rule have never had the police do anything positive for me. They have sexually harassed my daughters and wife. They have never prevented a crime against me or my family. They have never solved any of the same crimes. I have seen them break the law on numerous occasions. I have seen them lie their asses of in court under oath. A friend of mine was questioning the local Sheriff's tactics and two deputies drug his girlfriend out of her car and beat the $hit out of her.
Oh, and I live in rural white America. I can understand (but not condone) the Father's reaction in this case being it was a big city the climate that exists in Chicago. Liberal fail.