Sometimes it happens that a particular subgroup of employees will go on strike for better pay or better conditions. I don't have a problem with fighting for your rights or for your basic living requirements, but I think sometimes people lose sight of the fact that they are part of a much bigger machine. "You can't run a hospital without nurses." That's true. It doesn't make you the only important part, though. You also can't run a hospital without doctors. You can't run it very well for very long without janitors or administrators, either. You can't run a (modern) city without sanitation workers, but you also can't run it without power workers or water supply or police or firefighters or ambulances.
Mokalus of Borg
PS - Being critical to a complex system's success doesn't make you more important than anyone else.
PPS - You're just important. Be happy with that, and get what you need.