Today, the main job of the police is to protect Bad Guys from the Good Guys so that what you describe does not happen. Bad Guys are mostly protected by the system, and law-abiding Good Guys live in some degree of fear because they are not allowed to take out the trash. The rulers like it this way.
Look at Britian. The police over there arrest the locals and protect the invaders. You can’t even fly the flag of your own country or criticize anyone or go to jail, unless you are a “protected” class and then you can do whatever you want.