When I was a child I read picture story books which taught me that this was the purpose of police - to help citizens. They showed old ladies being helped across the road by humble bobbies and exhorted me to seek the nearest policeman if I ever became lost.
In adulthood it didn't take too many encounters with actual police to realise that they don't see their purpose the same way AT ALL.
Parents should be more responsible and teach their kids about police. One bad encounter can be the end of their child's life. Letting them read things like this without providing a realistic perspective is quite irresponsible, IMO. I grew up in a society where no one was deluded like this about the role of police. We all knew they were evil and out to hurt or kill us. Those lessons paid off after I moved to America. Here the cops are just as bad but many people kid themselves into thinking they are not. That's a delusional society.
In adulthood it didn't take too many encounters with actual police to realise that they don't see their purpose the same way AT ALL.