In the US, there is a history of white performers using blackface to play caricatures of black people, leaning hard on racist ethnic stereotypes. From Wikipedia:

The minstrel show, also called minstrelsy, was an American form of theater developed in the early 19th century.[1] The shows were performed by mostly white actors wearing blackface makeup for the purpose of comically portraying racial stereotypes of African Americans. There were also some African-American performers and black-only minstrel groups that formed and toured. Minstrel shows stereotyped blacks as dimwitted, lazy, buffoonish, cowardly, superstitious, and happy-go-lucky.[2][3] Each show consisted of comic skits, variety acts, dancing, and music performances that depicted people specifically of African descent.

Just to add onto what others are saying: to what extent do you think cops prevent crime? Most of what they do is catch people after the fact, and even then many (if not most) cases go unsolved.

I don’t have the statistics in front of me at the moment, but the comparison that should be made is crime prevented by cops vs. crime that only exists because of cops, including things that cops just never get prosecuted for. I understand the impulse to think that cops are at least better than nothing, but I don’t honestly know if that’s true.

Relevant XKCD

HELL YEAH BROTHER I LOVE MY MOM.