I love how every acab post inevitably brings out a bunch of uninformed libs in the comments talking about how pigs are only bad in America (as though the term ACAB was invented in America...) or how a society without them is completely inconceivable. As though badges grow on trees, like police are just a natural thing that sprung out of the ground.
The primary function of the police is to protect private property and enforce eviction. They're state agents who are allowed to use violence against working class people, and do so to prevent us from overthrowing the ruling class and redistributing wealth and the means of production. They protect class hierarchy. They attack protestors. They use state violence against the disenfranchised and the marginalized. The "just doing their job" of the police is to protect and preserve the unequal distribution of power in society. They do so by using violence against the working class. The rest of anything else they do is a small fraction of their job and entirely secondary to their primary functions.