And they only got there by striking and work actions because the nature of their positions gave them the leverage needed to be effective. The NYPD can't ship the factory to another country or bring in immigrant labour to do policing. If they aren't policing, property rights won't be enforced for businesses. Leverage. The police are the mechanism that break labour strikes and protests on behalf of capital. There is no such mechanism to break a police strike or protest, except the feds or the military which won't be used.

Most labour jobs do not have this kind of leverage because technology shrank the world and business has negotiated trade deal that give them the freedom to undermine worker leverage. Workers have no leverage to force capitulation. Labour has long lost any control they had to influence business practices and fight for themselves. Labour actions would have to be across the entire company to effectively force capitulation and that is next to impossible because labour ain't a community anymore thanks to anti-commie fear mongering. Every union is isolated, every location is separated, every company the corporate owns is independent from each other. Labour is too divided to stand united and united is the only way it effectively works. A group can't fight individual power with individual power, it must fight with collective power and for that, it needs to be united first.