I'm actually quite sure that the German police union disagrees with your assessment, and in your worldview unions are always right, aren't they?
Police unions are tied with teamsters' unions for being the worst ones out there.
That may very well be true but at the end of the day the overwhelming majority of policemen and policewomen are people who work very hard for relatively little money. That's why I would also expect them to be deserving of international labor solidarity.
A police union is essential a company union.