The police are held to higher standards than the general public. (Or, are supposed to be, anyway) They are supposed to be able to refrain from acting out of anger and malice. If one cannot do that, and perform their duty to protect and serve, they should not be in their field of business. Let's not forget, police culture is a major part of the reason things are in the state that they are today. As for the relevant incident currently under discussion in this thread, one only needs to read the article for the description of the incident:
In a follow-up video, Emerald explained the build-up to her recording, saying that as her little sister was waiting in line, the white woman had said: 'Excuse the f*** out of me, you n***** monkey.' Who knows. Perhaps the young girl accidentally bumped into the racist. Would that make this language and world view acceptable to you? Rhetorical question. I'm pretty sure I know the answer.