I dont see your comparison. Cops protect us and are a necessity in society. Unions are useless and only exist to take what they can. Gone are the days when they really protect workers rights. The fact is that the majority of the people in the nation do not work under a union contract. Most of the union workers are government workers. The union has an endless amount of money when dealing with the government. When the pension fund runs low they just tax more, see the PERA plan here in Denver.