If a police officer does something wrong. It does not matter what the evidence shows or what happens. All police everywhere stand firmly together and protect their brethren. We literally have police offers who have undeniably murdered people and yet other police still stand with their class and demand better treatment.
If workers had that level of solidarity things would be so much better. Instead we cheer when someone gets fired who “deserved” it.
Their role in society is very different from workers. They protect the interests of capitalists. As such, they’re allowed to have solidarity, because it does not affect the ruling class negatively. Not so for the proletariat.